Answer:
A. 154 
Step-by-step explanation:
The formula for the area of a circle is 
First find the radius by dividing the diameter by 2, which is 7


≈154 
Answer: -2
Step-by-step explanation:
(x+1)-(-2x-5)
=x+1+2x+5
=3x+6
=3(x+2)
Given the polynomial of degree 4, this can be written as:
x^4-100
let
x^2=a
thus the expression can be written as:
a^2-100
this is a polynomial of degree 2 also known as quadratic equation.
Hence the answer is:
<span>A) Quadratic formula</span>