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Question 453989: The total surface area of a cylinder of height 9.5 cm is estimated using the function f(r) = 6r2 + 60r, where r is the radius of the cylinder. If the radius of the cylinder is 5 cm, what is its total surface area?
answers:
a) 1200 cm(squared)
b) 450 cm(squared)
c) 187.5 cm(squared)
d) 60 cm(squared)
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! The total surface area of a cylinder of height 9.5 cm is estimated using the function f(r) = 6r2 + 60r, where r is the radius of the cylinder. If the radius of the cylinder is 5 cm, what is its total surface area?
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f(5) = 6*5^2+50*5
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f(5) = 150+250 = 400 cm^2
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That's f(5). It doesn't show any relation
to the 9.5 cm height which certainly is
a factor in determining the total surface
area.
Cheers,
Stan H.
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answers:
a) 1200 cm(squared)
b) 450 cm(squared)
c) 187.5 cm(squared)
d) 60 cm(squared)
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