Twenty-one is 25% of what number?

A. 5.25
B. 84
C. 10.5
D. 63

84

Step-by-step explanation:

When substituting this question into an algebraic equation you can write it as:

21=.25x

(x clearly represents the number you are trying to find)

When you divide both sides by .25 to isolate x you get x=84

Rotate triangle A  by 180° and then translate triangle A 5 units to the right. After this, Dilate it by a scale factor of "2"