Unit 7 Review

Find the balance of an account where $3,300 was deposited 3 years ago, earning 4% interest.

• $3,712.05

• $211,200.00

• $3,696.00

• $10,296.00

The values of expensive things like automobiles depreciate from year to year. Suppose you purchase a new car for $20,000 and it loses 20% of its value each year. Estimate the time when the car's value is only $700.

• 12 years

• 14 years

• 15 years

• 5 years

The value of an antique car is modeled by the function V(x)=107,000(1.009)^2/3x where x is the number of years since 2005. By what approximate percent rate is the value of the car increasing per year?

• 0.04%

• 0.14%

• 0.60%

• 1.40%

The sequence below shows the number of trees a nursery plants each year.

2, 8, 32, 128

Which formula could be used to determine the number of trees the nursery will plant next year, NEXT, if the number of trees planted this year, NOW, is known?

• NEXT = 4 * NOW

• NEXT = 2 * NOW + 4

• NEXT = ¼ * NOW

• NEXT = NOW + 6

Tags

CCSS.5.OA.B.3

Monica did an experiment to compare two methods of warming an object. The results are shown in the table below. Which statement best describes her results?

• The temperature using both methods changed at a constant rate.

• The temperature using both methods changed exponentially.

• The temperature using Method 2 changed at a constant rate.

• The temperature using Method 2 changed exponentially.

A fully loaded Toyota Forerunner sells for $42,000. It depreciates 12% per year from the date of purchase. How many years will it take to be worth half its value?

• 2 years

• 1 year

• 5 years

• 7 years

The function f(x)=3(4)^x was replaced with f(x)+k, resulting in the function graphed. What is the value of k?

• 4

• 3

• -5

• -6

Terry is given two salary options by his employer. The first option is a starting salary of $20,000 that increases by $500 each year he is with the company.

The second option is a starting salary of $20,000 that increases by 2.2% each year he is with the company. How many years will Terry have to be with the company for the salary with the second option to be greater than the salary with the first option?

• 11

• 12

• 13

• 14

The population of a town is modeled by the function:

P(t)=11,000(0.85)^4/5t

where t is the number of years since 2010. By what percent is the population of the town decreasing per year?

• 12%

• 88%

• 68%

• 32%

The function f(x)=4^x was replaced with f(x)+k, resulting in the function graphed. What is the value of k?

• 1

• -2

• 6

• 2