Exponential Rates

What is the Decay FACTOR for the exponential equation y = 25(.35)^x ?

• .35

• 65%

• 35.%

• 25

A population of 1500 deer decreases by 1.5% per year. In 10 years there will be 1290 deer. Does this problem represent growth or decay?

• growth

• decay

A population of 1500 deer decreases by 1.5% per year. In 10 years there will be 1290 deer. Identify the decay FACTOR, the "b-value".

• 0.85

• 0.015

• 1.015

• 0.985

• Growth

• Decay

What value goes inside the parentheses for the Growth Factor if something doubles every hour?

• 2

• 4

What value do you use for the exponent if a bacteria triples every 10 hours and you want to know how many bacteria there are 70 hours later? (HINT: How many times will the bacteria triple in 70 hours?)

• 700

• 10

• 70

• 7

You start out with 60 bacteria.   They triple every 10 hours.
How many bacteria do you have after 70 hours?

• 180

• 57

• 2187

• 63

You invest $5000 into an account that earns interest at 15% compounded annually. How much Interest have you earned after 2 years?

• $10,000

• $6612.50

• $1612.50

• 750

• Growth

• Decay

What is the Growth FACTOR?
Remember the Growth Factor is the value that you are going to multiply by itself as many times as the Exponent indicates.    If the Exponent (x) is 3 then you would multiply this value by itself 3 times.

• 5

• 1

• .02

• 1.02