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fespinoza019
04.05.2022 •
Mathematics
A garden measures 32 feet by 126 feet, and the owner of the garden wishes to divide the garden
into two parts by installing a fence from corner to corner. Find the cost of the total length of fence
if the fence costs $5.81 per foot.
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Ответ:
Step-by-step explanation:
a) The rate of change in volume is equal to the volume flow rate going in minus the volume flow rate going out.
W'(t) = F(t) − L(t)
At time t = 3, the slope of the line tangent to W(t) is W'(3).
W'(3) = F(3) − L(3)
W'(3) = arctan(π/2−3/10) − 0.03(20(3)−3²−75)
W'(3) ≈ 1.624
Using point-slope form, the linear approximation is:
y − 2.5 = 1.624 (x − 3)
y − 2.5 = 1.624 x − 4.872
y = 1.624 x − 2.372
The approximate volume at t = 3.5 is:
y = 1.624 (3.5) − 2.372
y = 3.312
b) W'(t) = arctan(π/2−t/10) − 0.03(20t−t²−75)
W"(t) = (-1/10) / (1 + (π/2−t/10)²) − 0.03(20−2t)
W"(8) = (-1/10) / (1 + (π/2−8/10)²) − 0.03(20−2(8))
W"(8) = -0.183
At t = 8 minutes, the flowrate is slowing down at a rate of 0.183 ft³/min².
c) If the rate of change of the volume (W'(t)) changes from positive to negative, then there must be a point where W'(t) = 0.
0 = arctan(π/2−t/10) − 0.03(20t−t²−75)
Solving with a calculator, t = 8.149 or t = 14.627. Since we're only considering 5 < t < 10, a possible point is t = 8.149.
Evaluate W'(t) before and after t = 8.149:
W'(8) = 0.027
W'(9) = -0.129
So yes, there is a time where the rate of change of the volume changes from positive to negative.
d) The tub is rectangular, so the volume of water is equal to the area of the base times the depth of the water:
W(t) = (0.5) (4) h
W(t) = 2h
Taking derivative:
W'(t) = 2 dh/dt
Evaluate at t = 6:
arctan(π/2−6/10) − 0.03(20(6)−6²−75) = 2 dh/dt
0.501 = 2 dh/dt
dh/dt = 0.250
The depth of the water is increasing at 0.250 ft/min.