AnswersNC-Math 4 CRAdding and Subtracting Matrices

Adding and Subtracting Matrices — Unit test Answers

15 verified answers
1
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The value of a baseball card can be represented by the equation , where x represents the number of years that Robert has owned the card and y represents the total value, in dollars, of the card. What was the value of the card when Robert originally purchased it?

Question illustration
A
$3
B
$13
C
$36
D
$39
2
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The number of pounds of dog food that a pet store has is represented by the equation , where x represents the number of days that the store is open and y represents the pounds of dog food in stock in the store. How many pounds of dog food will the pet store have after 21 days?

Question illustration
9
92
1
115
3
315
3
336
3

Lian was asked to write an equation and solve this problem. Shonda has some small spoons and 40 large spoons. If she has 68 spoons total, how many small spoons does Shonda have? Lian’s work is shown below. StepsLian’s WorkStep 1Step 2Step 3 In which step, if any, did Lian first make a mistake in her work?

Question illustration
A
step 1
B
step 2
C
step 3
D
no mistake
4

What is the value of x in the proportion below?

Question illustration
A
2
B
3
C
10
D
75
5

A local public library decides to track the number of hours that a certain computer is being used. The table represents the number of hours, y, which is dependent on the number of days, x. xy321537753What is the linear equation that represents this situation?

A
y = 8 x + 45
Option A
B
y = 8 x minus 3
Option B
C
y = 2 x + 16
Option C
D
y = 2 x minus 32
Option D
6

What is the value of x in the proportion below?

Question illustration
A
6
B
9
C
12
D
60
7

Rosa earns $12 per hour. In 7.5 hours, she will earn x dollars. Which is a valid proportion that can be used to solve the problem?

A
StartFraction x over 12 EndFraction = StartFraction 1 over 7.5 EndFraction
Option A
B
StartFraction 1 over 12 EndFraction = StartFraction x over 7.5 EndFraction
Option B
C
StartFraction 12 over 1 EndFraction = StartFraction x over 7.5 EndFraction
Option C
D
StartFraction 12 over 1 EndFraction = StartFraction 7.5 over x EndFraction
Option D
8

Zoe placed colored blocks on a scale in science class. Each block weighed 0.8 ounces. The total weight of all the colored blocks was 12.8 ounces. How many blocks did Zoe place on the scale? Write and solve an equation to find the answer.number of blocks =

Answer not available
9

Inez has a phone card. The graph shows the number of minutes that remain on her phone card after a certain number of days. The slope of the line that represents the data is –50, and the y-intercept is 850. What do the slope and y-intercept represent in Inez’s situation?

Question illustration
A
The y-intercept indicates that the phone card started with 850 minutes. The slope indicates that 50 minutes were used per day.
B
The y-intercept indicates that the phone card started with 50 minutes. The slope indicates that 850 minutes were used per day.
C
The slope indicates that the phone card started with 850 minutes. The y-intercept indicates that 50 minutes were added per day.
D
The slope indicates that the phone card started with 50 minutes. The y-intercept indicates that 850 minutes were added per day.
10

Eva spent $11.61 downloading songs, and each song cost $1.29. Four students wrote and solved equations to find s, the number of songs that she downloaded. Which student wrote and solved the equation correctly?

A
Seba’s work:
Option A
B
Ari’s work:
Option B
C
Erick’s work:
Option C
D
Daniel’s work:
Option D
11

Brian can type pages every 20 minutes. How many pages can he type in 2.5 hours?

Question illustration
A
7.5 pages
B
10 pages
C
22.5 pages
D
200 pages
12

Which equation represents the linear function that is shown on the graph below?

Question illustration
A
y = one-half x + 4
Option A
B
y = one-half x minus 2
Option B
C
y = 4 x minus 2
Option C
D
y = negative 2 x + 4
Option D
13

Millie needs a total of 7.8 feet of ribbon for a school project. She needs 0.7 more feet of ribbon. How much ribbon, in feet, did Millie already have? Write and solve an equation to find the answer.

A
6.9
B
7.1
C
7.5
D
8.5
14

Based on the graph of the line below, which describes the relationship between the value of the y-intercept and the value of the slope?

Question illustration
T
The y-intercept is 3, and the slope is .
Option T
T
The y-intercept is , and the slope is 3.
Option T
T
The y-intercept is 3, and the slope is 3.
T
The y-intercept is , and the slope is .
Option T
15

The linear equation when b = 5 and m = –2 is

A
y = 5x – 2.
B
y = 5x + 2.
C
y = –2x – 5.
D
y = –2x + 5.

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