AnswersPre-Algebra - MA3119 A Distance LearningAdding Integers

Adding Integers Answers

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Sheila wants to test the reasonableness of her answer to the expression below by using compatible numbers.Which equation would help Sheila do this?

Question illustration
A
10 + 20 + 10
B
–10 – 20 + 8
C
–10 + 20 + 10
D
10 + 20 – 8
2
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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.
3

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
4

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.
5

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.
6

Morena, a scuba diver, used the expression below to describe her position in relation to sea level.Which statement could describe the diver’s movements?

Question illustration
A
Morena started at 15 feet below sea level, then dove down 6 more feet.
B
Morena started at 15 feet above sea level, then dove down 6 more feet.
C
Morena started at sea level, dove down 15 feet, then dove down 6 more feet.
D
Morena started at sea level, dove down 15 feet, then rose up 6 feet.
7

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.
8

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
9

Which expression has the same value as the one below?

Question illustration
A
12 + (negative 9)
Option A
B
Negative 12 + 9
Option B
C
Negative 4 + (negative 9)
Option C
D
4 + (negative 9)
Option D
10

Which expression has the same sum as the one below?

Question illustration
A
15 + 6
Option A
B
Negative 6 + (negative 15)
Option B
C
15 + (negative 6)
Option C
D
6 + (negative 15)
Option D

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