Evaluate: (f+g)(-1)
f(x) = 5x^2 +7 (This reads 5x to the 2nd power plus 7)
g(x) = 3x - 6
Hint: (f+g)(x) = f(x) + g(x)
7
-7
-3
3

Q is a non-negative linear combination of permutation matrices.

A non-negative linear combination of permutation matrices is a matrix P that can be expressed as a linear combination of permutation matrices P1, P2, ..., Pn such that each coefficient in the linear combination is non-negative. This can be expressed as:

[tex]P = c1P1 + c2P2 + ... + cnPn[/tex]

where c1, c2, ..., cn are all non-negative real numbers. For example, consider the following matrix Q:

[tex]Q = \begin{bmatrix} 1 & 0 & 0 \\ 0 & 0 & 1 \\ 0 & 1 & 0 \end{bmatrix}[/tex]

We can express Q as a non-negative linear combination of permutation matrices P1, P2, P3 as follows:

[tex]Q = \frac{1}{3}\begin{bmatrix} 0 & 1 & 0 \\ 0 & 0 & 1 \\ 1 & 0 & 0 \end{bmatrix} + \frac{1}{3}\begin{bmatrix} 0 & 0 & 1 \\ 1 & 0 & 0 \\ 0 & 1 & 0 \end{bmatrix} + \frac{1}{3}\begin{bmatrix} 1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1 \end{bmatrix}[/tex]

Therefore, Q is a non-negative linear combination of permutation matrices.

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The Probability density function for the power P is f(P) = 1/2 * (1/P) for 162 < P < 242.

The power P is equal to 2I^2, so we can find the probability density function of P by finding the distribution of I first. A uniformly distributed random variable X over an interval (a, b) has a probability density function given by:

f(x) = 1/(b - a) for a < x < b

Since I is uniformly distributed over (9, 11), its probability density function is:

f(I) = 1/(11 - 9) = 1/2

Now, to find the distribution of P, we can use the transformation function P = 2I^2:

f(P) = f(I) * |dI/dP|

Using the chain rule, we have:

dI/dP = dI/d(2I^2) * d(2I^2)/dP = 1/2 * (2I) = I/P

So:

f(P) = f(I) * (1/P) = 1/2 * (1/P)

Now, we need to find the bounds for P. The power P can be calculated for any value of I between 9 and 11, so the bounds for P are:

P_min = 2 * 9^2 = 162

P_max = 2 * 11^2 = 242

Therefore, the probability density function for the power P is:

f(P) = 1/2 * (1/P) for 162 < P < 242

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____The given question is incomplete, complete question is given below:

A fluctuating electric current I may be considered a uniformly distributed random variable over the interval (9, 11). If this current flows through a 2-ohm resistor, find the probability density function of the power P = 2I^2.

The required inequality of the solutions of the given equation is (-∞, -6).

The idea of inequality, which is the state of not being equal, especially in terms of status, rights, and opportunities, is at the core of social justice theories. However, because it frequently has diverse meanings to different people, it is prone to misunderstanding in public discourse.

We have;

2w-1 < -13

2w < -13 + 1

2w < - 12

w < -6

Thus, required inequality of the solutions of the given equation is (-∞, -6)

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The work required to pump water out of the spout is calculated by multiplying the density of water (1000 kg/m3) by the height of the tank (h) and the area of the spout (a x b x c x d). The acceleration due to gravity (g) is 9.8 m/s2.

1. Calculate the volume of the tank:

V = a x b x c x d = 4 x 4 x 9 x 4 = 576 m3

2. Calculate the mass of the water in the tank:

m = V x density = 576 x 1000 = 576000 kg

3. Calculate the height of the tank:

h = m / density = 576000 / 1000 = 576 m

4. Calculate the work required to pump the water out of the spout:

W = m x g x h = 576000 x 9.8 x 576 = 3.11.107 x 576 = 1.79.107 J

The work required to pump water out of a spout can be calculated by multiplying the density of water (1000 kg/m3) by the height of the tank (h) and the area of the spout (a x b x c x d). The acceleration due to gravity (g) is 9.8 m/s2.To calculate the work, first we need to find the volume of the tank (V) by multiplying the length (a), width (b), height (c), and depth (d). Then we can calculate the mass (m) by multiplying the volume with the density of water. We can then calculate the height of the tank (h) by dividing the mass with the density. Finally, we can calculate the work required (W) by multiplying the mass, acceleration due to gravity, and the height of the tank.

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The equation of tangent to the curve y = 8√x  at the point (4,16) is  y = 2x + 8 .

We have to find equation of tangent line to the curve y = 8√x at the point (4, 16), we first find the slope ;

So , slope of the tangent line is  derivative of function y = 8√x at point (4, 16).

which means :  y' = 4[tex]x^{-\frac{1}{2} }[/tex]  ;

At the point (4, 16), the value of x is 4.

So , y' = 4 × [tex]4^{-\frac{1}{2} }[/tex] = 2 .

By Using the point slope form, the equation of the tangent line is ;

⇒ y - 16 = (2)(x - 4)  ;

Simplifying this equation, we get:

⇒ y - 16 = 2x - 8

⇒ y = 2x + (16 - 8)

⇒ y = 2x + 8 .

Therefore, the equation of the tangent line to the curve is y = 2x + 8 .

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The given question is incomplete , the complete question is

Find an equation for the tangent to the curve y = 8√x  at the point (4,16) .

(a) For no solution, we need the two equations to be inconsistent, which means that they cannot be satisfied simultaneously. We can achieve this by making the first equation a multiple of the second equation:

4(x1 + hx2) = 8

4x1 + 4hx2 = 8

4x1 + 8x2 = k

Now, we can see that the second equation is not compatible with the first equation since they imply contradictory statements:

4x1 + 8x2 = k and 4x1 + 4hx2 = 8

(b) For a unique solution, we need the two equations to be independent, which means that they are not multiples of each other. We can achieve this by choosing different coefficients for x1 and x2 in the two equations.

x1 + hx2 = 2 and 4x1 + 8x2 = k

To find the values of h and k that give a unique solution, we can solve the system by elimination or substitution. For example, we can multiply the first equation by 4 and subtract it from the second equation:

4x1 + 8x2 = k

-4x1 - 4hx2 = -8

Simplifying and dividing by -4, we get:

x2 = (2 + h)/2

x1 = (k - 4x2)/4

Since x1 and x2 are expressed in terms of h and k, we can choose any values of h and k that satisfy these equations, and the system will have a unique solution.

(c) For many solutions, we need the two equations to be dependent, which means that they are multiples of each other or one is a linear combination of the other. We can achieve this by making the second equation a multiple of the first equation:

x1 + hx2 = 2

4(x1 + hx2) = 8 + 4hkx2

4x1 + (4h - k)x2 = 8

Now, we can see that the second equation is a linear combination of the first equation, so the system has infinitely many solutions. To find the solutions, we can choose any value of x2 and solve for x1 in terms of x2:

x1 = (8 - (4h - k)x2)/4

Since x1 and x2 are expressed in terms of h and k, we can choose any values of h and k that satisfy the equation 4h - k = 0, and the system will have many solutions.

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The simple interest rate for the item is 13 1/3%.

Simple interest is the charge on borrowing calculated as a linear function of the amount borrowed, time and the interest rate.

Interest rate = interest / (time x amount borrowed)

Interest rate = N$16 / (N$480 x 0.25)

= 0.13333 = 13 1/3 %

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The graph of the given inequality of x > 23 is attached.

The relationship between two expressions or values that are not equal to each other is called inequality.

A number line can be used to represent numbers placed on regular intervals. A number line can be used to represent an inequality.

Given that the inequality of x > 23

We are asked to plot the given inequality on a number line.

x > 23

The above inequality says that, the value of x is equal to or greater than 23.

Hence, the graph of the given inequality is attached.

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a3 is greater than or equal to a4, then the subsequence a1, a2, a4 would form a monotonically increasing 3-chain. Hence, a3 must be less than a4.  If a1 < a5 < a4, then the subsequence a1, a4, a5 would form a monotonically increasing 3-chain any value of a5 results in a 3-chain.any sequence of five distinct integers must contain a 3-chain.

(a) Assume that a1 < a2 and there is no 3-chain in our sequence. Then, a3 cannot be greater than or equal to a2 (otherwise, the subsequence a1, a2, a3 would form a monotonically increasing 3-chain). Similarly, a3 cannot be less than or equal to a2 (otherwise, the subsequence a3, a2, a1 would form a monotonically decreasing 3-chain). Therefore, a3 must be strictly between a1 and a2. Now, if a3 is greater than or equal to a4, then the subsequence a1, a2, a4 would form a monotonically increasing 3-chain. Hence, a3 must be less than a4.

(b) From part (a), we know that a3 < a1. Also, since there is no 3-chain, a3 < a4 < a2. Combining these inequalities, we get a3 < a4 < a2 and a3 < a1. Hence, a3 < a4 < a2 < a1.

(c) Assume that a1 < a2 and a3 < a4 < a2. If a5 is less than a4, then the subsequence a3, a4, a5 would form a monotonically decreasing 3-chain. If a5 is greater than a2, then the subsequence a2, a5, a4 would form a monotonically decreasing 3-chain. If a4 < a5 < a2, then the subsequence a3, a4, a5 would form a monotonically increasing 3-chain. If a1 < a5 < a4, then the subsequence a1, a4, a5 would form a monotonically increasing 3-chain. Therefore, any value of a5 results in a 3-chain.

(d) Assume that there is a sequence of five distinct integers with no 3-chain. Without loss of generality, we can assume that a1 < a2. From part (a), we know that a3 < a1. From part (b), we know that a3 < a4 < a2 < a1. From part (c), we know that any value of a5 results in a 3-chain. Therefore, we have a contradiction and our assumption is false. Hence, any sequence of five distinct integers must contain a 3-chain.

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dydt = k(y-5)(y-0) where k is a positive constant. This equation has equilibrium solutions of y=0 and y=5, and y' is positive for 0<y<5 and negative for y<0 or y>5.

We can solve this problem by rearranging the equation to separate the y terms from the y' terms. We can do this by factoring the y terms on the left side, and then writing the equation as y' = k(y-5)(y-0). This equation has an equilibrium solution at y=0 and y=5, and the sign of y' depends on the sign of k. Since k is a positive constant, y' is positive when 0<y<5, and y' is negative when y<0 or y>5.  Thus, the equation dydt = k(y-5)(y-0) meets all of the given criteria. Therefore, dydt = k(y-5)(y-0) where k is a positive constant. This equation has equilibrium solutions of y=0 and y=5, and y' is positive for 0<y<5 and negative for y<0 or y>5.

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The following system of liner equation when converted into equivalent matrix gives us x =2, y = 3, z = -2.

Given that the augmented matrix is [AB] = [tex]\left[\begin{array}{cccc}1&2&2&4\\0&1&-3&9\\0&0&1&-2\end{array}\right][/tex]

Since p(A) = p(AB) = 3 = n = The number of variables

The system has unique solution

x + 2y + 2z = 4

y - 3z = 9

z = -2

y = 9 + 3z = 9 + 3(-2) = 3

x = 4-2y -2z

= 4 -2(3) -2(-2)

= 4 - 6 + 4

= 2

Therefore, the solution is x =2, y = 3, z = -2.

The abecedarian idea is to add multiples of one equation to the others in order to exclude a variable and to continue this process until only one variable is left. Once this final variable is determined, its value is substituted back into the other equations in order to estimate the remaining unknowns. This system, characterized by step ‐ by ‐ step elimination of the variables, is called Gaussian elimination.

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Complete question;

The augmented matrix of a system of equations has been transformed to an equivalent matrix in​ row-echelon form. Using​ x, y, and z as​ variables, write the system of equations corresponding to the following matrix. If the system is​ consistent, solve it.

left bracket Start 3 By 3 Matrix 1st Row 1st Column 1 2nd Column 2 3rd Column 2 2nd Row 1st Column 0 2nd Column 1 3rd Column negative 3 3rd Row 1st Column 0 2nd Column 0 3rd Column 1 EndMatrix Start 3 By 1 Table 1st Row 1st Column 4 2nd Row 1st Column 9 3rd Row 1st Column negative 2 EndTable right bracket

The recursive formula for p(n) is; p(n) = p(n-2) + p(n-3) for n >= 3. Case 1: The last square is painted white. If the last square is painted white, then the second to last square must be painted gold.

There are p(n-2) ways to paint the remaining n-2 squares of the checkerboard subject to the restriction.

Case 2: The last square is painted gold. If the last square is painted gold, then the second to last square can be painted either white or gold. If the second to last square is painted white, then there are p(n-3) ways to paint the remaining n-3 squares of the checkerboard subject to the restriction.

If the second to last square is painted gold, then there are p(n-2) ways to paint the remaining n-2 squares of the checkerboard subject to the restriction.

Therefore, the recursive formula for p(n) is: p(n) = p(n-2) + p(n-3) for n >= 3

with initial conditions p(1) = 2 and p(2) = 3.

The base case for the recursion is p(1) = 2 and p(2) = 3, which are the number of ways to paint a 1 x 1 checkerboard and a 1 x 2 checkerboard subject to the restriction, respectively.

The recursive formula counts the number of ways to paint a 1 x n checkerboard subject to the restriction by considering the last column of the checkerboard.

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Answer:

3x^2 - x - 10

Step-by-step explanation:

Foil (First, outside, inside, last)

3x^2 + 5x + -6x - 10

combine like terms

3x^2 - x - 10

Answer: We can use trigonometry to solve this problem. Let's call the angle of elevation of the lift from the lodge area to the top of Giffin's Gallop "θ". Then we can break down the lift into two parts: the horizontal distance from the lodge area to the top of Giffin's Gallop, and the vertical distance from the lodge area to the top of Giffin's Gallop.

Horizontal distance:

The horizontal distance from the lodge area to the top of Giffin's Haven is 1200 m * cos(43°) + 1500 m * cos(53°) + 30 m = 1759.29 m

The horizontal distance from the top of Giffin's Haven to the top of Giffin's Gallop is 30 m.

So, the total horizontal distance from the lodge area to the top of Giffin's Gallop is 1759.29 m + 30 m = 1789.29 m

Vertical distance:

The vertical distance from the lodge area to the top of Giffin's Haven is 1200 m * sin(43°) + 1500 m * sin(53°) + 40 m = 1174.70 m

The vertical distance from the top of Giffin's Haven to the top of Giffin's Gallop is 40 m.

So, the total vertical distance from the lodge area to the top of Giffin's Gallop is 1174.70 m + 40 m = 1214.70 m

Finally, using the tangent function, we can find the angle of elevation of the lift from the lodge area to the top of Giffin's Gallop:

θ = tan^-1(vertical distance / horizontal distance) = tan^-1(1214.70 m / 1789.29 m) = tan^-1(0.67967)

θ = 37.90° (approximately)

So, the angle of elevation of the lift from the lodge area to the top of Giffin's Gallop is approximately 37.90°.

Step-by-step explanation:

Answer:

[tex]\frac{1}{4}[/tex].

Step-by-step explanation:

[tex]\frac{4}{16}[/tex] is not in simplest form, so that will be our first step.

[tex]4[/tex] and [tex]16[/tex] are both have factors/are divisible by [tex]2[/tex] and [tex]4[/tex].

In order to get the fraction in simplest form fastest, divide by the GCF. (Greatest Common Factor)

Therefore, divide the Numerator, (top number) and Denominator, (bottom number) by [tex]4[/tex].

[tex]4[/tex] ÷ [tex]4[/tex] [tex]= 1[/tex].

[tex]16[/tex] ÷ [tex]4[/tex] [tex]= 4[/tex].

Therefore, the answer is [tex]\frac{1}{4}[/tex].

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Answer: 2.25 slices which is 9/4 slices i think im right

Step-by-step explanation:

add 1 1/4+2 3/4+3/4 which makes 4.75 slices or 19/4 slices do 7-4.75=2.25/9/4 slices

Answer:

Perimeter: 31 cm

Step-by-step explanation:

18.5 + 8.5 + 4 = 31 cm.

Can you send a picture of the math problem?

The size of sample are both large enough 40 and 35. The mean and standard deviation of given data is 0.05 and 0.105 respectively.

The shape of the sampling distribution of [tex]\hat{p}_j - \hat{p}_s[/tex]is approximately normal, according to the Central Limit Theorem. This is because the sample sizes are both large enough (40 and 35, respectively) and the population proportions are unknown but assumed to be independent.

The mean of the sampling distribution is the difference in the population proportions of females, which is 0.54 - 0.49 = 0.05.

The standard deviation of the sampling distribution can be calculated as:

[tex]$\sqrt{\frac{\hat{p}_j(1 - \hat{p}_j)}{n_j} + \frac{\hat{p}_s(1 - \hat{p}_s)}{n_s}}$[/tex]

where [tex]\hat{p}_j = 0.54$, $n_j = 40$, $\hat{p}_s = 0.49$, and $n_s = 35$.[/tex]Plugging in these values, we get:

[tex]$\sqrt{\frac{0.54(1 - 0.54)}{40} + \frac{0.49(1 - 0.49)}{35}} \approx 0.105$[/tex]

Interpretation: The standard deviation of the sampling distribution tells us how much we can expect the sample proportion difference to vary across different random samples. In this case, we can expect the difference between the sample proportions of females in the junior and senior classes to vary by about 0.105 on average across different samples.

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The remainder when Fn+1 is divided by Fn is Fn-1, and the remainder when Fn is divided by Fn-1 is Fn-2.

Let's denote the greatest common divisor of Fn+1 and Fn as d. We can use the Euclidean Algorithm to find d by repeatedly taking remainders.

First, we have:

Fn+1 = 1*Fn + Fn-1

So, the remainder when Fn+1 is divided by Fn is Fn-1.

Next, we have:

Fn = 1*Fn-1 + Fn-2

So, the remainder when Fn is divided by Fn-1 is Fn-2.

We can continue this process by repeatedly dividing the larger number by the smaller number and taking remainders until we reach a remainder of 0. The last nonzero remainder we obtain is the greatest common divisor of Fn+1 and Fn.

For example, to find the greatest common divisor of F6 = 8 and F7 = 13, we have:

F7 = 1F6 + F5, so the remainder is F5 = 5

F6 = 1F5 + F4, so the remainder is F4 = 3

F5 = 1F4 + F3, so the remainder is F3 = 2

F4 = 1F3 + F2, so the remainder is F2 = 1

F3 = 2*F2 + 0, so we stop here

Therefore, the greatest common divisor of F7 and F6 is d = 1, and the remainders in the Euclidean Algorithm are 5, 3, 2, and 1.

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The solution of the expression 2 x 2[tex]\frac{1}{5}[/tex] is 4.4.

Multiplication is a type of mathematical operation. The repetition of the same expression types is another aspect of the practice.

For instance, the expression 2 x 3 indicates that 3 has been multiplied by two.

Given:

Two fractions are 2 and 2[tex]\frac{1}{5}[/tex].

To find the product of two fractions:

Applying multiplication operation,

we get,

2 x 2[tex]\frac{1}{5}[/tex]

To simplify further;

Converting mixed fractions to improper fractions,

we get,

2 x 11/5

= 22/5

= 4.4

Therefore, 2 x 2[tex]\frac{1}{5}[/tex] = 4.4.

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The graph of the system of inequalities is in the image at the end.

Here we have a system of inequalities, first we want to solve them:

-x + 3y ≤ 3

-2x + y ≥ -2

Isolating y in both of these we will get:

y  ≥ -2 + 2x

y ≤ (3 + x)/3

So we just needto graph the two lines, on the first one we will shade the region above the line and on the second one we will shade the region below the line.

The graph of the system is on the image below.

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The second part of Theorem 6 states that if w is any solution of the linear system Ax=b, and p is a particular solution of Ax=b, then the difference vector v=h−p is a solution of the homogeneous system Ax=0.

We will now prove this statement.

Since p is a particular solution of Ax=b, we have A*p = b. Then we can write w = p + v, where v = w - p.

To show that v is a solution of Ax=0, we need to show that Av=0.

We have:

Av = A(w-p) = Aw - Ap

Since Aw = b (by the assumption that w is a solution of Ax=b) and Ap = b (by the assumption that p is a particular solution of Ax=b), we can simplify this to:

A*v = b - b = 0

Thus, v is a solution of Ax=0, as required.

Therefore, every solution of Ax=b has the form w=p+v, where p is a particular solution of Ax=b and v is a solution of Ax=0.

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The probability of the continuous random variable X taking on a value greater than one is e⁻¹, which is approximately 0.368.

In probability theory, random variables are used to represent uncertain events. A continuous random variable is a variable that can take any value within a given range of values. The probability density function (PDF) of a continuous random variable is a function that describes the likelihood of the variable taking on a certain value. In this question, we are given the PDF of a continuous random variable and asked to find the probability of the variable taking on a value greater than one.

The given PDF is

=> f(x) = e⁻ˣ, 0 < x < ∞.

To find P{X > 1}, we need to integrate the PDF from 1 to infinity.

P{X > 1} = ∫(1 to ∞) e⁻ˣ dx

Using integration by parts, we get:

P{X > 1} = [-e⁻ˣ](1 to ∞)

= lim t → ∞ [-e⁻ˣ + e⁻¹)]

= e⁻¹

In conclusion, the probability density function of a continuous random variable is used to describe the likelihood of the variable taking on a certain value. In this question, we used the PDF to find the probability of the continuous random variable taking on a value greater than one. By integrating the PDF, we obtained the probability to be e⁻¹, which is approximately 0.368.

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Complete Question:

A continuous random variable X has a probability density function f ( x ) = e⁻ˣ , 0 < x < ∞ . Then P{X > 1} is

(a) The rate of change of the brightness after t days is dB/dt = (2π/4.4) * 0.45 * cos(2πt/4.4).

(b) The rate of increase after one day is  0.22 radians/day.

For the given case the equation for the brightness of cepheid joe is  B(t)=4.2 +0.45sin(2pit/4.4). This equation tells us that the brightness of the star is determined by the sine of the time multiplied by a constant. Since the sine of a number is always changing, the brightness of the star is always changing too.

Therefore, the rate of change of the brightness is given by the derivative of the equation, which is   2π/4.4)*0.45*cos(2πt/4.4), when t is  1 day, we can plug this value into the equation to get the rate of increase after one day, which is dB/dt = (2π/4.4) * 0.45 * cos(2π/4.4) = 0.22 radians/day.

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To determine the maximum height of a shampoo bottle that can stand upright on the middle shelf, we need to consider the height of the shelf above and below it.

Since there are three shelves, the middle shelf is located at the height of 9 inches (half of the total height).

To find the maximum height of a shampoo bottle that can stand upright on the middle shelf, we need to subtract the height of the middle shelf from the total height of the system, and then divide the result by two, since there are two spaces above and below the middle shelf.

Therefore, the maximum height of a shampoo bottle that can stand upright on the middle shelf is: (18 - 9) / 2 = 4.5 inches

So, the maximum height of a shampoo bottle that can stand upright on the middle shelf is 4.5 inches.

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The relationship between y and t can be modeled by an exponential function of the form:

y = a x e^(-rt)

An exponential function is a mathematical function which we write as a

f(x) = aˣ, where a is constant and x is variable term. The most commonly used exponential function is eˣ , where e is constant having value 2.7182

The relationship between y and t can be modeled by an exponential function of the form:

y = a x e^(-rt)

where a is the initial area of the forest (1500 km²), r is the rate of decrease (6.25%), and t is the number of years since 2000.

To find the value of r, we can convert 6.25% to a decimal:

r = 0.0625

Now we can plug in the values for a and r into our exponential function:

y = 1500 x e^(-0.0625t)

This exponential function shows the relationship between the area of the forest and the number of years since 2000.

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Answer:

let the Becky's age be x

21=3x

x = 7

Answer:

a = 21 / 3

Step-by-step explanation:

If he's 3 times older than her, then you divide by 3.

The component form of the vector is <3, -5, 6>, the magnitude of the vector is √70, then the unit vector is <0.386, -0.643, 0.643>.

The initial and terminal points to find the component form of the vector, calculated its magnitude, and then divided the component form by the magnitude to find a unit vector in the direction of v.

To find the component form of the vector, you can subtract the coordinates of the initial point from the coordinates of the terminal point. In this case, we have:

v = (4, 1, 6) - (1, 6, 0)

v = (3, -5, 6)

So the component form of the vector is v = <3, -5, 6>.

To find the magnitude of the vector, we can use the formula:

|v| = √(3² + (-5)² + 6²)

|v| = √70

Therefore, the magnitude of the vector is √70.

Finally, to find a unit vector in the direction of v, we can divide the component form of v by its magnitude:

u = v/|v|

u = <3/√70, -5/√70, 6/√70>

So the unit vector in the direction of v is u = <0.386, -0.643, 0.643>.

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The system of equation that does not belong to the other two is the third system of equations; y = -4·x - 3, y + 4·x = -5, This is so because, the third system has no solutions.

A linear system of equations consists of two or more linear equations that consists of common variables.

The possible equations are;

y = x + 6, y = -x + 2

3·x + y = -1, y = 4·x + 6

y = -4·x - 3, y + 4·x = 5

Evaluation of the system of equations, we get;

First system of equations;

y = x + 6, y = -x + 2

x + 6 = -x + 2

x + x = 2 - 6 = -4

2·x = -4

x = -4/2 = -2

x = -2

y = x + 6

y = -2 + 6 = 4

y = 4

The solution is; x = -2, y = 4

Second system of equation;

3·x + y = -1, y = 4·x + 6

3·x + 4·x + 6 = -1

7·x + 6 = -1

7·x  = -1 - 6 = -7

x = -7/7 = -1

x = -1

y = 4·x + 6

y = 4 × (-1) + 6 = 2

y = 2

The solution to the second system of equation is; x = -1, y = 2

Third system of equation;

y = -4·x - 3, y + 4·x = 5

y + 4·x = 5

-4·x - 3 + 4·x = 5

-4·x + 4·x - 3 = 5

0 - 3 = 5

-3 = 5

The third system of equation has no solution

The system of equations that does not belong with the other two is the third system of equation; y = -4·x - 3, y + 4·x = 5, that has no solution.

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The probability that both prizes were won by two people of the same sex is 0.48

Let's call the number of men in the small party "m" and the number of women in the small party "w". The total number of people in the party is "m + w = 10 + 12 = 22".

The number of ways to choose two people of the same sex can be calculated as follows:

The number of ways to choose two men is "C(m,2) = C(10,2) = 45".

The number of ways to choose two women is "C(w,2) = C(12,2) = 66".

The total number of ways to choose two people without replacement is "C(22,2) = 231".

The probability that both prizes were won by two people of the same sex is then given by the sum of the probabilities for two men or two women:

P(same sex) = (C(10,2) / C(22,2)) + (C(12,2) / C(22,2)) = (45/231) + (66/231) = 111/231 = approx. 0.48

So, the probability that both prizes were won by two people of the same sex is approximately 0.48

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