Writing and interpreting exponential functions

• The interest the savings account earned for the first year.

• The annual interest rate of the savings account.

• The number of years the savings account has earned interest.

• The starting balance of the savings account.

What is the initial value for the equation?

y = 200(1.8^x)

• 200

• 1.8

• 80%

An elk population after x months can be modeled by the function

g(x) = 300(1.2)^x. Which statement is the best interpretation of one of the values in this function?

• The elk population increased by 12 elk each month.

• The elk population decreased by 12 elk each month.

• The elk population increased at a rate of 20% each month.

• The elk population decreased at a rate of 20% each month.

What is this graph showing you?

• The worlds population is staying the same.
• The worlds population is going down (decreasing).
• The worlds population was growing but now is decreasing.
• The worlds population has been growing and will continue to grow. 

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

• SLOPE
• RATE OF CHANGE
• Y-INTERCEPT (starting value)

• COMMON RATIO

The function f(x) = 800(1.02)^x models money in a savings account. What is the initial amount of money?

• $800

• $1.02

• $816

• $16

 $f\left(t\right)=100\left(2\right)^t$  represents the number of rabbits in a forest after  $t$  years. How many rabbits were there initially? (Answer in context)

• There were 100 rabbits initially. 

• There were 2 rabbits initially.

• There were 2 rabbits initially.

Given y = (6)^x

What is the initial amount?

• 6

• 1

• 0

• -6

The number of people with the flu during an epidemic is a function, f, of the number of days, d, since the epidemic began. The equation f(d) = 50·(3/2)d defines f

How quickly is the flu spreading?

• (2/3) per day

• (3/2) per day

• 50·(3/2) per day

• 50 per day