Test5

Find x

• 2

• 4

• 9

• 10

• -1+12i

• -1-6i

• 15+12i

• 15-6i

On Saturday afternoon, Armand sent m text messages each hour for 5 hours, and Tyrone sent p text messages each hour for 4 hours. Which of the following represents the total number of messages sent by Armand and Tyrone on Saturday afternoon?

• 9mp

• 20 mp

• 5m + 4p

• 4m + 5p

Kathy is a repair technician for a phone company. Each week, she receives a batch of phones that need repairs. The number of phones that she has left to fix at the end of each day can be estimated with the equation P = 108 − 23d , where P is the number of phones left and d is the number of days she has worked that week. What is the meaning of the value 108 in this equation?

• Kathy will complete the repairs within 108 days.

• Kathy starts each week with 108 phones to fix.

• Kathy repairs phones at a rate of 108 per hour.

• Kathy repairs phones at a rate of 108 per day.

Which of the following is equivalent to the expression above?

• A

• B

• C

• D

h = 3a + 28.6

A pediatrician uses the model above to estimate the height h of a boy, in inches, in terms of the boy’s age a, in years, between the ages of 2 and 5. Based on the model, what is the estimated increase, in inches, of a boy’s height each year?

• 3

• 5.7

• 9.5

• 14.3

The formula above gives the monthly payment m needed to pay off a loan of P dollars at r percent annual interest over N months. Which of the following gives P in terms of m, r, and N ?

• 
• 
• 
• 

If a/ b = 2, what is the value of 4b/a ?

• 0

• 1

• 2

• 4

3x + 4y = −23

2y − x = −19

What is the value of y to the system of equations above?

• 8

• 0

• -1

• -8