Answer:
the answer is r= 1/2(121)
Step-by-step explanation:
the radius is half of the diameter
Answer: 4.2
Step-by-step explanation: 20 x 21
100
= 4.2
The sum would be
4x^2-x+1
add like terms.
3x^2+x^2
4x^2
4x+-5x
-x
3-2
1