CPM Homework Help : MC1 Problem 4-9

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4-9.

Simplify each expression.

$−42 + \left(−17\right)$
Hint 1(a & b):
For help with parts (a) and (b), refer to the Math Notes box from Lesson 3.4.4.
Hint 2(a & b):
Pay close attention to these similar examples. How can you use the examples to simplify the expressions?

$8 − \left( −9\right)$

$8\left( −9\right)$
Hint (c):
Now, refer to the Math Notes box from Lesson 3.4.3 for help with multiplication using negative numbers.

$−42 ÷ \left( −7\right)$
Hint 1(d):
Having trouble with division? Can you think of how this can relate to a multiplication problem?
Hint 2(d):
Also, refer to problem MC1 3-127 in Lesson 3.4.4 for more guidance.
Answer (d):
The expression simplified is $6$ .

$−2\left( −3\right)\left( −4\right)$
Hint (e):
Read the Math Notes box from lesson 3.4.3 for help with multiplying more than two factors.
This section may be especially helpful.
Answer (e):
The expression simplified is $−24.$

$−18 − 7$
Hint (f):
Subtracting is like taking steps backwards. Can you draw a picture to help solve this problem?
Answer (f):
The expression simplified is $−25$ .

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