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The missing side is 12.

Step-by-step explanation:

To find the answer you want to divide the sides that are similar.

15/5=3

9/3=3

Both answers are three so you want to multiply 4 by 3 which equals 12.

The missing side is 12.

Step-by-step explanation:

divide the sides that are similar.

15/5=39/3=3

Both answers are three so you want to multiply 4 by 3 which will equal 12.

"a" determine whether sage found the correct quotient. show your work

step-by-step explanation:

b. would be the answer : )

step-by-step explanation:

step 1: add -16x to both sides.

16x−4y+−16x=64+−16x  

−4y=−16x+64

step 2: divide both sides by -4.

−4y /-4 = -16x + 64/-4

answer:   y=4x−16

hope i'm right