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.
Find the (exact) direction cosines and (rounded to 1 decimal place) direction angles of = (3,7,6)
Let a = (-1, -2, -3) and 6 = (-4, 0, 1).
Find the component of b onto a.
Forces of 9 pounds and 15 pounds act on each other with an angle of 72°.
The magnitude of the resultant force
The resultant force has an angle of
pounds.
* with the 9 pound force.
The resultant force has an angle of
with the 15 pound force.
It is best to calculate each angle separately and check by seeing if they add to 72°.
Chapter 1 Solutions
Calculus and Its Applications Plus MyLab Math with Pearson eText -- Access Card Package (11th Edition) (Bittinger, Ellenbogen & Surgent, The Calculus and Its Applications Series)
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