Answer:
D?
Step-by-step explanation:
A). 4r − 3
There are no like terms.
= 4r − 3
B). x + 7
= x + 7
18. x=(-3)
20.x=(-2)
22.x=4
65.12 mm
Circumference of semicircle = 8π mm
Perimeter = (40 + 8π) = 65.12 mm