Concept Test

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2

A) R, S, T B) S, R, T

C) R, T, S D) None of the above

Slide 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

Slide 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)?

Slide 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

Slide 13

Concept Test

On your logarithic 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

Slide 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

Slide 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.

Slide 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

Slide 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

Slide 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

Slide 19