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answer:

(D) 3040

Step-by-step explanation:

The surface area formula for a rectangular prism with side lengths x,y, and z is 2(xy+yz+zx). Plugging in the numbers, we get 2(320 (40*8) + 200 (8*25) + 1000 (40*25). Simplifying, we get our answer to be 3040.

The solution to the system of equations are  x = 7 and y = -1

2x + 3y = 11 equation 1

3x + 3y = 18 equation 2

The equations given are simultaneous equations. They would be solved using the elimination method.

In order to use the elimination method, take the following steps:

1. Subtract equation 1 from equation 2

x = 7

2. Substitute for x in equation 1

2(7) + 3y = 11

3. Expand the bracket

14 + 3y = 11

4. Combine similar terms

3y = 11 - 14

5. Add similar terms

3y = -3

6. Divide both sides of the equation by 3

y = - 1

To learn more about simultaneous equations, please check: link