Calculus Help please….
A pebble is dropped into a calm pond, causing ripples in the form of concentritic circles. The radius r of the outer ripple is increasing at a constant rate of 1. ft. per sec. When the radius is 4 ft., at what rate is the total area of the disturbed water changing?

I would love for someone to explain to me how to work this problem out…. please and thank you

Question

Calculus Help please…. 
A pebble is dropped into a calm pond, causing ripples in the form of concentritic circles. The radius r of the outer ripple is increasing at a constant rate of 1. ft. per sec. When the radius is 4 ft., at what rate is the total area of the disturbed water changing?

I would love for someone to explain to me how to work this problem out…. please and thank you

anonymous · Answer

@jessiedeee You won't learn anything if you keep avoiding to participate !!!

anonymous · Answer

@Chlorophyll sometjing came up… I do want to learn

anonymous · Answer

something*