Chapter 9 - Exponential Functions

How do you write 5% as a decimal?

• 50
• 5
• 0.5
• 0.05

What type of function is f(x)=2(.75)^x ?

• exponential growth

• linear

• exponential decay

• none of the above

What type of function is y = 7(1.25)^x?

• exponential growth

• exponential decay

• linear

• none of the above

What is the y-intercept of the function?

• 2
• 3
• 1
• -2

Tags

CCSS.HSF-IF.C.7E

What does the y-intercept of the graph represent?

• The amount of grams the material is gaining.
• The amount of grams the material is losing.
• The amount of grams remaining after so many years.
• The initial amount of grams.

Tags

CCSS.HSF.LE.B.5

Which of the following is an increasing exponential function whose y-intercept is 50?

• y = 50(.05)^x
• y = 50x - 4
• y = (2)^x + 50
• y = 50(1.4)^x

Tags

CCSS.HSF.LE.A.2

In an exponential function, what does the 'a' represent?

• slope

• rate of change

• y intercept

• common ratio

If f(x) = 300(1.16)^x represents a bank account, how much money did the account start with?

• $300

• $1.16

• $0.16

• $348

The function f(x) = 12(1.015)^t represents the population of elephants in a wildlife refuge after t years since 1975.

Is the population of elephants increasing or decreasing?

• increasing

• decreasing

A new savings account is opened with $400 and gains 3% every year. Write a function to represent the situation.

• f(x)=400(1+3)^x

• f(x)=400(1-0.03)^x

• f(x)=400(1+0.03)^x

• f(x)=400(0.03)^x