The answer to question 1 is here, I don't understand question 2 so I can't answer it.
Find the circumference:
Circumference = 2 x pi x radius
Circumference = 2 x 3.14 x 9 = 56.52 inches
the arc length is 45 degrees/360 degrees of the circumference.
Marc length = 56.52 x 45/360 = 7.065 inches
Rounded to the nearest tenth = 7.1 inches
Using the identity (a+b)(a+b) = a^2 + 2ab + b^2 we get the answer 4Z^2 + 20Z + 25
Melanie pumps 2 in per hr....Lori pumps 4 in per hr
so Lori pumps water at a faster rate
Yolanda writes 1 per day...Zoe writes 2 per day
so Zoe has higher the rate of production
