The cross-section of a sphere is a circle . The area of a circle can be calculated by the formula A=
Where r is the radius of the circle.
Given :
Solving for r we have:

Or r= 10.
The area of a sphere is calculated by the formula :

Substituting r value we have:
SA= 
The total surface area of this sphere is 400π .
Answer:
a = 1
Step-by-step explanation:
7*9 =
We can rewrite 9 as 10-1
7 * (10-1)
7 * 10 - 7*1
a = 1
Answer:
c
Step-by-step explanation:associative: a+(b+c)=(a+b)+c
commutative: a+b=b+a
distributive: a(b+c)=ab+ac
inverse: I think it is a times 1/a=1, doesn't matter
Answer: A) y = -4
<u>Step-by-step explanation:</u>
The midline is usually at y = 0. In the given equation, the graph is shifted down 4 units so the new midline is at -4.