AnswersPre-Algebra - MA3119 A Distance LearningAdding Integers

Subtracting Integers Answers

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Rita is adding . She rewrites the expression as . What is Rita’s error?

Question illustration
A
She used the commutative property, which cannot be used with negative numbers.
B
In the new expression, –8 and 1 should both be negative.
C
She used the associative property which should only be used with positive numbers..
D
She switched the negative signs for –8 and 1.
2
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Ahmed is riding the elevator in a building. The building has floors above and below ground level. Ahmed uses the expression below to describe his movement.Which statement could describe Ahmed’s movement?

Question illustration
A
Ahmed started 6 floors above ground level, then he went down 8 floors.
B
Ahmed started 6 floors above ground level, then he went up 8 floors.
C
Ahmed started 6 floors below ground level, then he went up 8 floors.
D
Ahmed started 6 floors below ground level, then he went down 8 floors.
3

A meteorologist used the expression below to describe how the temperature changed. Which statement could describe how the temperature changed?

Question illustration
A
The temperature was –5 degrees, then it increased 4 degrees.
B
The temperature was –5 degrees, then it decreased 4 degrees.
C
The temperature was 5 degrees, then it increased 4 degrees.
D
The temperature was 5 degrees, then it decreased 4 degrees.
4

The temperature at 9 a.m. is 2 degrees. The temperature rises 3 more degrees by noon. Which expression describes the temperature at noon?

A
2 + 3
Option A
B
2 + (negative 3)
Option B
C
Negative 2 + (negative 3)
Option C
D
Negative 2 + 3
Option D
5

A scuba diver used the expression below to describe his position in relation to sea level.Which statement could describe the diver’s movements?

Question illustration
A
Starting on a platform 2 feet above sea level, dive down to a location that is 18 feet below sea level, and then rise 8 feet.
B
Starting on a platform 2 feet above sea level, dive down to a location that is 20 feet below sea level, and then rise 8 feet.
C
Starting 2 feet below sea level, dive down 20 more feet, and then rise to a location that is 8 feet below sea level.
D
Starting 2 feet below sea level, dive down 18 more feet, and then rise to a location that is 8 feet below sea level.
6

Sebastian was in a hotel lobby and took the elevator up 7 floors to his room. Then he took the elevator down 9 floors to the parking garage. He described his movement with the expression below.What is Sebastian’s error?

Question illustration
A
Sebastian should have used –9 and 7.
B
Sebastian should have started at zero before adding –7.
C
Sebastian should have switched the two addends and written .
Option C
D
Sebastian should have used 0 and –9.
7

Carlos is using a number line to add another integer to –4. He begins by showing –4 on the number line, as shown below. Carlos adds the other integer on the number line and says that the sum is negative.Which is true of the number Carlos added to –4?

Question illustration
A
The number must be a negative integer.
B
The number must be a positive integer.
C
The number could be 3 or any integer less than 3.
D
The number could be 4 or any integer greater than 4.
8

Which sum does the model below represent?

Question illustration
A
4 + (negative 7) = negative 3
Option A
B
4 + 7 = 11
Option B
C
8 + (negative 3) = 4
Option C
D
11 + (negative 4) = negative 3
Option D
9

What is the value of the expression?

Question illustration
A
Negative 28
Option A
B
Negative 4
Option B
C
4
D
28
10

Indira is using a number line to add . She begins by showing –1 on the number line, as shown below.What is the sum of ?

Question illustration
A
–4
B
–3
C
2
D
3

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