Math 1 Unit 3 Post Assessment Review

Which equation below is exponential?

• f(x) = 2(3)^x

• f(x) = 2x³

• f(x) = 3x

Which function is decaying the fastest?

• f(x) = 10(1/3)^x

• (x) = 10(2/3)^x

• f(x) = 10(2)^x

Write the NOW-NEXT form of the following geometric sequence.

1, 2, 4, 8, 16, ...

• NEXT = NOW X 2

• NEXT = NOW X 3

• NEXT = NOW X 1/2

Which equation below represents exponential growth?

• f(x) = 10(2)^x

• f(x) = 10(1/2)^x

• f(x) = 10(1/5)^x

Evaluate f(x) = 3(4)^x

for x = 2

• 144

• 48

• 16

A radio-active atom has a half-life of a day. This means that it decays by 1/2 each day. Write an equation for this exponential function if you start with 100 grams.

• f(x) = 1/2(100)^x

• f(x) = 1/2x + 100

• f(x) = 100(1/2)^x

Which function below is decaying the fastest?

y = (1/5)^x -or- y = (3/4)^x ?

• not enough information

• y = (1/5)^x

• y = (3/4)^x

Assuming the pattern in the table continues, what is the function value when x = 6?

• 144

• 288

• 576

Write the NOW-NEXT form of the following geometric sequence.

320, 160, 80, 40, ...

• NEXT = NOW X 2

• NEXT = NOW X (1/2)

• NEXT = NOW X (1/3)

In the geometric sequence below, what is the common ratio?

81, 27, 9, 3, ...

• 3

• (1/2)

• (1/3)