Exponential Growth & Decay

What is the formula for exponential decay

• A=P(1+r)^t
• I=PRT
• A=P(1+r/n)^tn
• A=P(1-r)^t

Tags

CCSS.HSF-IF.C.8B

You invested $400 into an account with 7.5% interest rate compounded monthly. Which equation can be used to calculate how much you will have in 7 years? 

• A=7.5(1+400)^7
• A=400(1+7.5)^7
• A=400(1+.075/12)^7.5(12)
• A=400(1+7.5/12)^12(7)

You have a job with a starting salary of $50,000. According to your contract you will receive a 1.5% raise every year and want to find out how much you will have in 6 years.
What part of the equation would change if you received a 1.5% raise every month?

• t
• n
• r
• P

Tags

CCSS.HSF.BF.A.2

A car tire fully inflated is losing 2.5% of its air everyday. The tire originally contained 4500 cubic inches of air. Which equation could be used to represent the loss of air

• A=4500(1+2.5)^t
• A=4500(1+.025)^t
• A=4500(1-.025)^t
• A=4500(1-2.5)^t

Tags

CCSS.HSF.LE.A.2

Your parents invested money in an account and used the equation A=15,000(1+.06/365)^365(30)
How long was the money in the account?

• 1 year
• 15 years
• 30 years
• 6 years

You invested money in an account and used the equation A=10,000(1+.09/4)^4(10)
The interest rate is being compounded__________________.

• Daily
• Weekly
• Monthly
• Quarterly

You are saving money in an account and used the equation A=15,000(1+.06/365)^365(30)
What would be the first operation you would do to find out how much money you have?

• Multiply
• Divide
• Add
• Subtract

Your family found 100,000 in a bag on the side of the rode. If you put in the bank and earned 9% interest on the money how much interest will you have earned after 2 years.
Which formula will use

• A=P(1+r)^t
• A=P(1+r/n)^tn
• A=P(1-r)^t
• I=PRT

In the formula A=P(1+r)^t
What does P mean

• Rate
• Starting Amount
• Interest as a decimal
• Final Amount

You are receiving .369% interest on a savings account. In calculating interest what would this rate look like?

• .369
• 36.9
• .00369
• 3.69