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:

Step-by-step explanation:




5400*0.04(rate)=216
Because it's simple interest for 7 years, 216*7 should be the answer
So $1512
What does the sign ‘’ ^ ‘’ mean ? I am trying to solve this but I don’t understand that sign