If the dimensions of a solid proportionally increase by a scale factor of 5/2, by what factor does the surface area increase?

A. 5/2

B. 5/4

C. 25/2

D. 25/4

D

Step-by-step explanation:

Given that the dimensions of  a solid are in proportion a : b, then

then the ratio of the area is a² : b²

Thus

scale factor = , then

area factor = = → D

(x, y)→(x − 8, y − 7)

step-by-step explanation:

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answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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