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Section 3.8

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Question 6

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B0/1 pt 52 99 0 Details

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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B0/1 pt 52 99 0 Details

X + 1

Find the inverse of f(x)

2x + 3

f-1(2)

=

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Section 3.8

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Question 8

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50/1 pt 52 99 0 Details

Let

f()

=

x + 3

X + 9

f-1( – 8) =

=

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Question 10

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50/1 pt 52 99 0 Details

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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Question 9

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B0/1 pt 52 99 0 Details

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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