AnswersAFC ACCUPLACER-Math S3Writing and Evaluating Expressions

Writing and Evaluating Expressions Answers

11 verified answers3 views
3

What was Myra’s error?

A
Myra should have multiplied -31.7 and 2.1 first.
B
Myra should have multiplied 4.5 and 2.1 first.
C
Myra should have subtracted -27.2 and 2.1 first.
D
Myra should have added -31.7 and 2.1 first.
6

What mistake did she make? What is the correct answer?

Answer:

Gaira made a mistake when substituting the value –7.5 for x because she multiplied both terms of the expression by –7.5 instead of only multiplying the coefficient –3.8. The correct calculation is -3.8(-7.5) + 6, which equals 28.5 + 6. The correct answer is 34.5.

10

Evaluate the expression shown for x = 9.

Question illustration
A
Negative 13 and one-third
Option A
B
Negative one-half
Option B
C
7 and one-third
Option C
D
9 and two-thirds
Option D
11

Check all that you included in your response.

A
She multiplied both terms by -7.5.
B
Only -3.8 should have been multiplied by -7.5.
C
She substituted incorrectly.
D
The correct answer is 34.5.

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