Average profit. Cruzin’ Boards has found that the cost, in dollars of producing x skateboards is given by C ( x ) = 900 + 18 x 0.7 . If the revenue from the sale of x skateboards is given by R ( x ) = 75 x 0.8 , find the rate at which average profit per skateboards is changing when 20 skateboards have been built and sold.
Average profit. Cruzin’ Boards has found that the cost, in dollars of producing x skateboards is given by C ( x ) = 900 + 18 x 0.7 . If the revenue from the sale of x skateboards is given by R ( x ) = 75 x 0.8 , find the rate at which average profit per skateboards is changing when 20 skateboards have been built and sold.
Solution Summary: The author calculates the rate at which average profit per skateboard is changing when 20 vases have been produced and sold.
Average profit. Cruzin’ Boards has found that the cost, in dollars of producing x skateboards is given by
C
(
x
)
=
900
+
18
x
0.7
.
If the revenue from the sale of x skateboards is given by
R
(
x
)
=
75
x
0.8
, find the rate at which average profit per skateboards is changing when 20 skateboards have been built and sold.
5
Use the method of disks to find the volume of the solid that is obtained
when the region under the curve y = over the interval [4,17] is rotated
about the x-axis.
3. Use the method of washers to find the volume of the solid that is obtained
when the region between the graphs f(x) = √√2 and g(x) = secx over the
interval ≤x≤ is rotated about the x-axis.
4. Use cylindrical shells to find the volume of the solid generated when the
region enclosed by the given curves is revolved about the x-axis.
y = √√x, y = 0, y = √√3
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