A farmer depreciates a $120,000 tractor. He estimates that the resale value V t in $1000 of the tractor t years after purchase is 80 % of its value from the previous year. Therefore, the resale value can be approximated by V t = 120 0.8 t . a. Find the resale value 5 yr after purchase. Round to the nearest $1000 . b. The farmer estimates that the cost to run the tractor is $ 18 / hr in labor, $36 / hr in fuel, and $22 / hr in overhead colts (for maintenance and repair). Estimate the farmer's cost to run the tractor for the first year if he runs the tractor for a total of 800 hr. Include hourly costs and depreciation.
A farmer depreciates a $120,000 tractor. He estimates that the resale value V t in $1000 of the tractor t years after purchase is 80 % of its value from the previous year. Therefore, the resale value can be approximated by V t = 120 0.8 t . a. Find the resale value 5 yr after purchase. Round to the nearest $1000 . b. The farmer estimates that the cost to run the tractor is $ 18 / hr in labor, $36 / hr in fuel, and $22 / hr in overhead colts (for maintenance and repair). Estimate the farmer's cost to run the tractor for the first year if he runs the tractor for a total of 800 hr. Include hourly costs and depreciation.
A farmer depreciates a
$120,000
tractor. He estimates that the resale value
V
t
in $1000
of the tractor t years after purchase is
80
%
of its value from the previous year. Therefore, the resale value can be approximated by
V
t
=
120
0.8
t
.
a. Find the resale value 5 yr after purchase. Round to the nearest
$1000
.
b. The farmer estimates that the cost to run the tractor is
$
18
/
hr
in labor,
$36
/
hr
in fuel, and
$22
/
hr
in overhead colts (for maintenance and repair). Estimate the farmer's cost to run the tractor for the first year if he runs the tractor for a total of 800 hr. Include hourly costs and depreciation.
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
Using and Understanding Mathematics: A Quantitative Reasoning Approach (6th Edition)
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