Test 7--Exponential Growth and Decay

Is this exponential growth or decay?

• Growth
• Decay

Tags

CCSS.HSF-IF.C.8B

Is this exponential growth or decay?

• Growth
• Decay

Tags

CCSS.HSF-IF.C.7E

Suppose a culture of bacteria begins with 5000 cells and dies by 30% each year. Write an equation that represents this situation.

• y=5000(0.7)^x
• y=30(5000)^x
• y=5000(1.3)^x
• y=5000x^x

Tags

CCSS.HSF.LE.A.2

Make the percent to decimal.
245%

• .245
• 0.245
• 2.45
• 24.5

Make the percent to decimal.
7.25%

• 7.25
• 72.5
• 0.725
• 0.0725

Your shiny new boat cost $7650.  The depreciation for your boat is 14% per year.  What is the equation that models this problem for the value of the vehicle in 3 years?

• y= 7650(.14)³
• y= 7650(.86)³
• y= 7650(-.14)³
• y= 7650(1.14)³

Tags

CCSS.HSF.LE.A.2

CCSS.HSA.CED.A.1

CCSS.HSF.LE.A.1

CCSS.HSA.SSE.A.1

You put your money into a savings account that earns 8% interest compounded annually.  If you originally invested $1,240, how much is in your account after 2 years?

• $1,438.40
• $1297.94
• $1,446.34
• $4017.60

Tags

CCSS.HSF-LE.A.1C

Jay'den earned $475 from mowing lawns last summer. He deposited this money in an account that pays an interest rate of 3.8% compounded annually. What will be his balance after 15 year?

• $827.52
• $831.10
• $839.45
• $846.80

If I had a baseball that was worth $3500 and it was reported to increase in value at a rate of 5% per year what would the ball be worth in 7 years?  How long would it take for the baseball to double in value? 

• Worth $4924.90 in 7 years and it would take between 14 and 15 years for it to double in value
• Worth $4924.90 in 7 years and it would take between 19 and 20 years for it to double in value
• Worth $4690.30 in 7 years and it would take between 14 and 15 years for it to double in value

A population of 1500 deer decreases by 1.5% per year. At the end of 10 years, there will be approximately 1290 deer in the population. Which function can be used to determine the number of deer, y, in this population at the end of t years?

• y = 1500(1 - 0.015)^t
• y = 1500(0.015)^t
• y = 1500(1 + 0.015)^t
• y = 1500(1.5)^t

Tags

CCSS.HSF.LE.A.2