Second Semester Exam Review

Which the following graphs represents an exponential decay function?

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• 
• 
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• exponential growth (increasing)

• exponential decay (decreasing)

• both growth and decay

Pick the equation that represents exponential growth (is increasing).

• y=2(0.5)^x

• y = 0.5(2)^x

What is the domain of the function?

• x > -4

• y > -5

• y < -4

• all real numbers

What is the asymptote of y = 2^(x-3) ?

• y = 0

• y = -3

• x = 0

• x = -3

What is the y-intercept of the function?

• 2
• 3
• 1
• -2

Write an equation that models the following situation:
Samantha's hair was known to grow very rapidly. It began at a length of 6 in and grew at a rate of 14% a week.

• y=6(0.14)^x
• y=6(1+14)^x
• y=6(1.14)^x
• y=6(0.86)^x

Which of the following functions shows an initial amount of $15 and an increase of 35% each year?

• y = 15(35)^x
• y = 15(1.35)^x
• y = 15(0.35)^x
• y = 35(1.15)^x

Identify the y-intercept (initial value) in the function f(x)=13(.27)^x

• (.27)^x
• .27
• 13
• 3.51

Identify the y-intercept (initial value) of the function f(x)=2(4)^x.

• 2
• 4
• (2)^x
• 8