Two students created models of the same building.
One student used a scale factor of 3 centimeters
(cm) = 15 meters (m). The second student used a
scale factor of 4.5 = 15 m. The height of the original
building is 20 meters. What is the difference
between the heights of the two students' models?

12cm

the answer is d

x is the total time in minutes for the free response

you are given number of questions as 15 - m and time per item as 8 minutes

to find x multiply the two givens together:

x = 8 * (15-m) = 8(15-m)

since we know that the two functions are equal, f (x) = g

(x), therefore when we equate the two equations the result should be similar to

3x = x – 4:

a. f(x) = 3x, g(x) = x – 4

equating the two functions:

3x = x – 4             (correct)

so we now got our answer (a)