9. The area of a circle is 706.97 in2. Find the radius.

15

Step-by-step explanation:

Using the formula

A=πr2

Solving

r=√A/π

r=√706.97/22/7

r≈15.00118

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb

$8

step-by-step explanation:

it is pretty much backwards.

you take the 4x2 multiply that, and that is = $8