20. A restaurant supplier services the restaurants in a circular area in such a way that the radius r is increasing at the rate of 3 km per year at the moment when r goes through the value r = 5 miles. At that moment, how fast is the area increasing? c. 25 km² per year d. 30 km² per year a. 20 km² per year b. 24 km? per year

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter12: Quadratic Functions
Section12.8: Joint And Combined Variation
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20. A restaurant supplier services the restaurants in a circular area in such a way that the
radius r is increasing at the rate of 3 km per year at the moment when r goes through
the value r = 5 miles. At that moment, how fast is the area increasing?
c. 25 km² per year
d. 30 km² per year
a. 20 km² per year
b. 24 km? per year
Transcribed Image Text:20. A restaurant supplier services the restaurants in a circular area in such a way that the radius r is increasing at the rate of 3 km per year at the moment when r goes through the value r = 5 miles. At that moment, how fast is the area increasing? c. 25 km² per year d. 30 km² per year a. 20 km² per year b. 24 km? per year
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