Answer with Step-by-step explanation:
We are given that

a.Radius =25 m
We have to find rate of change of radius.
We know that
Area of circle,
Differentiate w.r.t time

Substitute the values then we get



b.A=
Substitute the values then we get





Substitute the values then we get

m/s
m/s
Answer:
m^2+4m-21
Step-by-step explanation:
(m-3)(m+7)
m^2-3m+7m-21
m^2+4m-21
Well, we have 700 novels and we want to choose 3 novels, so we use a combination : 700 c 3 (using the nCr button on a TI calculator) is 56,921,900. So, the answer is 56,921,000! Hope this helps!