AnswersNC-Math 4 CRAdding and Subtracting Matrices

Adding and Subtracting Matrices — Unit test Answers

25 verified answers
1
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What are the values of c and d in the matrix subtraction below?

Question illustration
A
mc009-2.jpg
Option A
B
mc009-3.jpg
Option B
C
mc009-4.jpg
Option C
D
mc009-5.jpg
Option D
2
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Jonas made the following matrix of temperatures for the first 4 days of January. He also made the following matrix of temperatures for the first 4 days of February. Which matrix shows the difference of January and February?

Question illustration
A
mc005-3.jpg
Option A
B
mc005-4.jpg
Option B
C
mc005-5.jpg
Option C
D
mc005-6.jpg
Option D
3

What is the value of given the matrix equation below?

Question illustration
A
2
B
8
C
26
D
28
4

What is the value of C in the matrix equation below?

Question illustration
A
mc021-2.jpg
Option A
B
mc021-3.jpg
Option B
C
mc021-4.jpg
Option C
D
mc021-5.jpg
Option D
5

Which property is shown in the matrix addition below?

Question illustration
A
commutative property
B
associative property
C
inverse property
D
identity property
6

A polygon has vertices at (–5, 3), (–1, 3), (1, 0), and (–3, 0). Which represents a geometric translation of the given polygon 4 units to the right and 5 units down?

A
mc028-1.jpg
Option A
B
mc028-2.jpg
Option B
C
mc028-3.jpg
Option C
D
mc028-4.jpg
Option D
7

Marrisa added 1.56 and 13.47. She got 29.07. What mistake could Marrisa have made?

A
She forgot to move the decimal point to the left after she added.
B
She lined up the front numbers instead of the decimal places.
C
She lined up the last numbers instead of the decimal places.
D
She didn’t carry correctly between place values.
8

What is the product?0.2 x 0.1

A
0.0002
B
0.002
C
0.02
D
0.2
9

What are the values of m and n in the matrix addition below?

Question illustration
A
mc008-2.jpg
Option A
B
mc008-3.jpg
Option B
C
mc008-4.jpg
Option C
D
mc008-5.jpg
Option D
10

Rangsey is doing a science experiment on evaporation. He fills a container of water and measures the height of the water in the container as 24.5 centimeters. After 15 days, the height of the water is 0.8 of its original height. What is the height of the water in the container after 15 days?

A
0.76 centimeter
B
1.96 centimeters
C
7.6 centimeters
D
19.6 centimeters
11

What is the sum of the matrices shown below?

Question illustration
A
mc001-2.jpg
Option A
B
mc001-3.jpg
Option B
C
mc001-4.jpg
Option C
D
mc001-5.jpg
Option D
12

At birth, a puppy weighed 5.5 ounces. When it was adopted 9 weeks later, its weight was 3.5 times its birth weight. What was the puppy’s weight when it was adopted?

A
17.05 ounces
B
19.25 ounces
C
170.5 ounces
D
192.5 ounces
13

What is the product?0.9 x 0.5

A
0.0045
B
0.045
C
0.45
D
4.5
14

Ramone wrote the following matrix equation.Which explains why Ramone’s equation has no solution?

Question illustration
A
There is no number that when summed with 8 equals 0.
B
The matrices must be of the same size in order to perform addition or subtraction.
C
The sum of 8 and –12 is not 3.
D
The matrices must measure in order to be added together.
Option D
15

What is the distance between A and B on the number line below?

Question illustration
A
0.55
B
0.65
C
2.48
D
4.85
16

Which is the best estimate of the product of 0.9 x 0.88?

A
0
B
0.25
C
0.5
D
1
17

Naeem weighs different salad takeout containers. The containers respectively weigh 4.5 ounces, 5.01 ounces, 5.3 ounces, 4.75 ounces, and 4.9 ounces. Which is the best whole number estimate of how much all the containers weigh together?

A
22 ounces
B
24.46 ounces
C
24.5 ounces
D
25 ounces
18

Which shows how to best estimate the product of 0.4 x 0.93?

A
0 x 1 = 0
B
0.5 x 0.5 = 0.25
C
0.5 x 1 = 0.5
D
1 x 1 = 1
19

In the equation below, variables X and Y represent two matrices. Which property of matrix addition is illustrated below?

Question illustration
A
inverse property
B
commutative property
C
associative property
D
identity property
20

What is the value of D in the matrix equation below?

Question illustration
A
mc020-2.jpg
Option A
B
mc020-3.jpg
Option B
C
mc020-4.jpg
Option C
D
mc020-5.jpg
Option D

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