Which of these is a unit rate? 18 student in a class, 18 students in 18 chairs, 18 students in a 6 rows or 18 students in 2 reading groups?

just take the area of the square and then the area of the circle then subtract the circle area from the squares area

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