SOLUTION: A 39-ounce can of Hills Bros. coffee requires 188.5 square inches of aluminum. If its height is 7 inches, what is its radius? )
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Question 146645This question is from textbook New Mexico Edition College Algebra
: A 39-ounce can of Hills Bros. coffee requires 188.5 square inches of aluminum. If its height is 7 inches, what is its radius? )
This question is from textbook New Mexico Edition College Algebra
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
Lateral surface area of cylinder=2pi*r*h
surface area of top and bottom combined=2pi*r^2
2pi*r*7+2pi*r^2=188.5
14pi*r+2pi*r^2=188.5
2pi(7r+r^2)=188.5
r^2+7r=188.5/2pi
r^2+7r=30 approx.
r^2+7r-30=0
(r+10)(r-3)=0
r=3"
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