Math Models Unit 5 Saving Money Review Lessons 1-10

What is y when x=40? 
Hint: Find the value of x on the x-axis. From there, move vertically upwards until you reach the graph. From the graph, move horizontally to the left until you reach the y-axis. The value of y is the corresponding coordinate on the y-axis.

• About 120
• About 150
• About 190
• About 210

Tags

CCSS.HSF.IF.A.2

What is x when y=300?
Hint: Find the given value of y on the y-axis. From there, move horizontally to the right until you reach the graph. From the graph, move downwards until you reach the x-axis. The value of x is the corresponding coordinate on the x-axis.

• About 61
• About 66
• About 69
• About 72

Simplify.
3(4-2.8)³
Hint: Perform the operation within the parenthesis first and then raise the result to the exponent. Multiply this result by the number preceding the parenthesis.

• About 4.73
• About 5.18
• About 53.86
• About 263.42

Tags

CCSS.7.EE.B.3

Solve.
50=6.2x
Hint: Divide both sides of the equation by the coefficient of x.

• x≈0.12
• x≈8.06
• x≈56.2
• x≈43.8

Tags

CCSS.6.EE.B.7

Solve.
45x=11
Hint: Divide both sides of the equation by the coefficient of x.

• x=56
• x=34
• x≈4.09
• x≈0.24

Tags

CCSS.6.EE.B.7

Dayna deposited $2700 into a savings account that pays a simple annual interest rate of 1.6%. How much interest will she earn after 6 months?
Hint: I=prt; The interest is equal to the product of the principal, the rate converted to a decimal, and the time in years (don't forget to convert the 6 months to a fraction of year, or 6/12)

• $21.60
• $49.20
• $259.20
• $281.25

Tags

CCSS.HSF.BF.A.2

Colby deposited money into a savings account that pays a simple annual interest rate of 1.8%. He earned $334.80 in interest after 6 years. How much did he deposit?
Hint: P=I/rt; Divide the interest earned by the product of the annual interest rate as a decimal and the time in years.

• $18,600.00
• $11,160.00
• $3,100.00
• $2,008.80

Tags

CCSS.6.EE.B.7

Deangelo deposited $9350 into a savings account for which interest is compounded daily at a rate of 2.58%. How much interest will he earn after 12 years?
Hint: A=P(1+r/n)^nt; Use the compound interest formula to find the total balance in 12 years. Subtract $9350 from this amount to find the interest earned in 12 years.

• $2821.91
• $3392.79
• $244.36
• $252.50

Sophie deposited money into an account in which interest is compounded semiannually at a rate of 3.2%. She made no other deposits or withdrawals and the total amount in her account after 7 years was $13,987.17. How much did she deposit?
Hint: A=P(1+r/n)^nt; Substitute the given values into the compound interest formula. Then, solve the resulting equation for the principal.

• $9000
• $11,200
• $12,125
• $13,550

The graph shows the total amounts in two accounts with the same principal and annual interest rate.
After 35 years, how much more did the account with compound interest earn than the account with simple interest?
Hint: Use the graphs to estimate the amount of simple and compound interest earned in 35 years. Subtract the estimate for simple interest from the estimate for compound interest.

• About $175
• About $240
• About $490
• About $650

Tags

CCSS.8.F.A.2

CCSS.HSF.IF.C.9