Diameter = 21 inches
Circumference
Area

Radius: 10.5

Circumeference: 65.97

Area: 346.36

Step-by-step explanation:

Circumference: 65.9734 inches

Area:  346.361 square inches

Step-by-step explanation:

If the diameter is 21 inches, we know the radius, r, is 10.5 inches because the radius measure is half of the diameter.

Circumference Formula: 2πr

=2π(10.5)

=65.9734 inches

Area formula: π

π(10.5)^2

= 346.361 square inches

2 equivalent expressions to represent the area of a rectangle and the top is n-3 and the side is 2

area of the rectangle = length * width

given length = n - 3

width = 2

replace it in the area

so area of the rectangle = (n-3) *2

= 2(n-3)

one of the expression is 2(n-3)

to get another expression we distribute 2 inside the parenthesis

2(n-3) is 2n - 6

so another expression is 2n - 6

two equivalent expression are

2(n - 3)   , 2n - 6

the answer to that one is b