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## Concept Test

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### Three cars have the following functions that give the total cost of ownership as ... After 60,000 miles, which car has had the lowest cost of ownership? Concept Test ... – PowerPoint PPT presentation

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Title: Concept Test

1
Concept Test
• A jogger runs away from campus at a steady rate,
stops to talk to some friends, runs away from
campus for a little longer, and then returns to
campus. Which graph below could show the
joggers distance as a function of time?

2
Concept Test
• Suppose the average rate of change of jobs in
Caddo Parish with respect to time is 10,000
jobs/year for the period from 1995 to 2005. Which
statement is most accurate?
• Each year, the number of jobs increased by
10,000.
• The number of jobs never decreased.
• Both A) and B)
• Neither A) nor B)

3
Concept Test Which slope is largest?
4
Concept Test
• Given the graph on the right of y f(x), which
of the below numbers is most positive?
• A f(2) f(0)
• B the average rate of change of f from x 0 to
x 2
• C the average rate of change from x -2 to x
0

5
Concept Test
• All four linear functions below are graphed on
the right. Which one is the red line?
• A y 4 x
• B y 4 2x
• C y 2 2x
• D y 2 4x

6
Interpretation
• Three cars have the following functions that give
the total cost of ownership as a function of the
number of miles traveled
• Car A y 15,000 .14 n
• Car B y 28,000 .20 n
• Car C y 22,000 .09 n
• Which car was most expensive to purchase?
• Which car is the cheapest to operate per mile?
• After 60,000 miles, which car has had the lowest
cost of ownership?

7
Concept Test
• (Multiple answers possible) Which of the below
tables shows a linear function?
• D None of the above

8
Concept Test
• For which functions is y not directly
proportional to x?
• For which functions is y not a linear function of
x?

9
Concept Test
• You have been offered three different jobs job R
has a base salary of 55,000 with annual raises
of 2000, job S has a base salary of 45,000 with
annual raises of 3200, and job T has a base
salary of 48,000 with annual raises of 2000.
Assuming you will be working at this job for many
years, how should you rank the jobs according to
the income you will receive?
• A) R, S, T B) S, R, T
• C) R, T, S D) None of the above

10
Concept Test
• Given two linear equations, how many solutions
can the system have?
• A) Exactly one solution or no solution
• B) Exactly one solution or infinitely many
solutions
• C) Exactly one solution, no solutions, or
infinitely many solutions
• D) Any number of solutions

11
Concept Test
• The graph on the right shows three different tax
systems as a function of income. Which
represents a progressive tax (that is, where
richer people pay a higher percentage of their
income on taxes)?

12
Concept Test
• Which statement below is correct?
• A (-3x2)3 -3(x2)3 -3x6
• B (-3x2)3 -(3x2)3 -27x6
• C (-3x2)3 (-3)3(x2)3 -27x5
• D None of the above

13
Concept Test
• On your logarithmic scale of time, where does 500
years ago fit?
• A closer to the 102 mark than to the 103 mark
• B closer to the 103 mark than to the 102 mark
• C exactly between the 102 and the 103 mark

14
Concept Test
Which of the following is true? A f(x) is
exponential and g(x) is linear B f(x) is neither
linear or exponential C g(x) is neither linear
or exponential D f(x) is linear and g(x) is
exponential
15
Concept Test
• A population of bacteria is described by y
200(2.75)t where t is measured in days. Which
statement is correct?
• A The population is growing at 75 per day.
• B The population is growing at 275 per day.
• C The population is growing at 175 per hour.
• D None of the above.

16
Concept Test
• If all functions below are graphed, which graph
is the blue graph?
• y 200(.5)x
• y 200(1.1)x
• y 100(1.5)x
• y 200(.2)x

17
Concept Test
• Which of the below functions has a half life of 8
days? (In all functions, t measures days.)
• A y 100(1/8)t
• B y 25(8)t
• C y 30(1/2)t/8
• D y 8(1/2)8t

18
Concept Test
• What will the half-life be for the equation y
50(.5)4t where t is measured in days?
• .25 days
• 4 days
• 50 days
• None of the above

19
Concept Test
• If you know that log a is about .301, which of
the following statements is true?
• A log(100a) is about 2.301
• B log(a2) is about .090601
• C Both A and B are true
• D Neither A nor B are true

20
Concept Test
• Suppose you know that ln(a) equals .25. What can
you say about ln(ae4)?
• A It equals 4.25.
• B It equals .25 e4
• C It equals .254.
• D None of the above.