MATH 128 Baltimore City Community College Inverse & Radical Functions Questions

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Section 3.8
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Question 6
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1
Let f(a)
=
X + 5
f-1(x) =
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Section 3.8
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Question 7
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X + 1
Find the inverse of f(x)
2x + 3
f-1(2)
=
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Section 3.8
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6 VO
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Question 8
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Let
f()
=
x + 3
X + 9
f-1( – 8) =
=
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Section 3.8
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Question 10
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The formula v = v V2.5r models the maximum safe speed, v,
in miles per hour, at which a car can travel on a curved road
with radius of curvature r, in feet. A highway crew measures
the radius of curvature at an exit ramp on a highway as 390
feet. What is the maximum safe speed?
For this problem, round your answer DOWN to the nearest
whole number. (Think: Why is this type of rounding
appropriate for this scenario?)
max safe speed =
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Section 3.8
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Question 9
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Police use the formula:
V =
20L
to estimate the speed of a car, v, in miles per hour, based
on the length, L, in feet, of its skid marks when suddenly
braking on a dry, asphalt road. At the scene of an accident,
a police officer measures a car’s skid marks to be 174 feet
long. Approximately how fast was the car traveling? Round
your answer to the nearest tenth (one decimal place) of a
unit.
Answer: The car was traveling at approximately
miles per hour.
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