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

not enough information

step-by-step explanation:

we cannot know this, because the other students could have handed out 10 flyers, or they could have handed out 100. one way, the mean would go up, and another way, the mean would go down.