The triangles are confusing please help

D. b=15 and a=7

Step-by-step explanation:

compare the left triangle to the right triangle by looking at the short sides

How do we get from 9 to 3?

setting an equation

9x = 3

divide both sides by 9

x = 3/9 simplified to 1/3

The scale factor is 1/3

so a is:

21 × 1/3 = 7

b is:

5 ÷ 1/3 = 15

i believe it's a.

i'm not sure on this one, most likely correct.

range =5

step-by-step explanation:

to find the range, we take the largest value and subtract the smallest value.

the largest value is 5

the smallest value is 0

the range is 5-0   =5