SOLUTION: Please help me solve for the indicated letter: for r s=1/3(pie)hr^2+4(pie)rh Thank you

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Question 213832This question is from textbook Intoductery Algebra
: Please help me solve for the indicated letter:
for r
s=1/3(pie)hr^2+4(pie)rh
Thank you This question is from textbook Intoductery Algebra

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
s=1/3(pie)hr^2+4(pie)rh
It's pi, the Greek letter, not pie, the dessert.
s=%28pi%2Ahr%5E2%29%2F3%2B4pi%2Arh+
r%5E2%2A%28h%2Api%2F3%29+%2B+r%2A4%2Api%2Ah+-+s+=+0
r%5E2+%2B+12r+-+3s%2F%28pi%2Ah%29+=+0
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Use the quadratic formula
r+=+-6+%2B+sqrt%2836+%2B+3s%2F%28pi%2Ah%29%29
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r+=+-6+-+sqrt%2836+%2B+3s%2F%28pi%2Ah%29%29 If s is >0 this will give a negative value for r, so ignore it.