327 Words2 Pages

Graded Assignment
Unit Test, Part 2: Numbers, Expressions, and Equations
Answer the questions below. When you have finished, submit this assignment to your teacher by the due date for full credit.
(5 points)
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1. The local theater charges $8 for a child’s ticket and $12 for an adult’s ticket.
a. Write an expression that describes the amount of money needed to buy x child tickets and y adult tickets for a group.
b. Evaluate the expression to find the total price of 9 tickets for children and 4 tickets for adults.
Answer: The cost will be 120 for 9 tickets for children and 4 tickets for adult’s
8x+12y
8x+12y=8 ×9+12×4
8×9 12×4
72 + 48
= 120
(10 points)
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2. Vicky has a cell-phone plan that charges $45 per month and $0.15 for every minute that she uses the phone beyond what her plan allows. Last month, she was billed $54.60.
a. Define a variable for the unknown.
b. Write an equation to model the problem.
c. Solve the equation. Show your work.
d. Find the number of minutes that she went over the time that the plan allows.
Answer: she went over 64 minutes
M= over minutes
45+ __M
45+ .15M
54.60= 45+.15M
54.60- (45) = 45- (45) +.15M
Which equals 9.6= .15M
9.6/ (.15) = .15M/ (.15)
That changes into 64= M.
(5 points)
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3. Lori wants to deposit money into a bank account that earns 3.5% simple annual interest. Use the formula to find the amount of money that she should deposit so that she earns $7000 in interest after 5 years. Show and explain your work.
Answer: x = $5893.81
I=PRT (Interest = Principal x Rate x Time)
Let the

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