Exponential Word Problems

Write an equation that represents the following scenario: Chlorine kills germs at a rate of 0.8% every second. The dish starts with 7000 germs.  How many germs do you have after x seconds?

• y=7000(1.008)^x
• y=.992(7000)^x
• y=7000(.992)^x
• y=7000(.92)^x

Tags

CCSS.HSF.LE.A.2

Write an equation to represent the following scenario: The population of a small town increases by 15% every year.  If the population began with 730 people, how many people would there be in x year?

• y=730(1.15)^x
• y=1.15(730)^x
• y=730(15)^x
• y=730(.85)^x

Tags

CCSS.HSF.LE.A.2

What is the decay rate of the function? y =50(.90)^x

• 50%
• 90%
• 10%
• .90%

Tags

CCSS.HSF-IF.C.8B

Solve. 

• $6000
• $6515.58
• $6594.89
• $6588.04

What is the initial value of the function? y = 80(1.75)^x

• 80

• 1.75

• .75

• 75

Tags

CCSS.HSF.LE.B.5

Ash has $8,000 in a savings account. The interest rate is 3% compounded once a year.

To the nearest cent, how much will he have in his account in 4 years?

• $9,004.07

• $2,2848.80

• $9,011.94

• $8,242.71

Tags

CCSS.HSF-LE.A.1C

A sailboat that costs $5,950 decreases in value by 11% per year. How much will the boat be worth after 6 years?

• $5,884.00

• $5,178.97

• $2,992.96

• $2,957.04

Tags

CCSS.HSF.BF.A.2

The population of Pallet Town increases by 15% every year. If there are currently 190,000 people living there, what will be the population in 13 years?

If necessary, round your answer to the nearest whole number.

• 4 people.

• 22,972 people.

• 1,169,030 people.

• 1,188,311 people.

Tags

CCSS.HSF-LE.A.1C

Katy deposited $90 in a savings account earning 5% interest, compounded quarterly. Which of the following equations could represent the amount of money in her account yearly?

• 
• 
• 
• 

Derrick has $1,000 in a savings account that ears 15% interest, compounded monthly. To the nearest cent, how much will he have in 2 years?

• $5,350.25

• $1,322.50

• $1,025.16

• $1,347.35