CPM Homework Help : CC1 Problem 4-9

4-9.

Simplify each expression below. For each expression, draw a picture or show how you know your answer makes sense.

Hint (a):
Use a drawing such as the one to the right to help you make sense of the problem. A number line with a point, labeled, 5.
More Help 1 (a):
Starting at $5$ , add $-4$ . In other words, subtract 4. Added to the number line, an arc connecting 1 to 5, with a label of negative 4.
More Help 2 (a):
Now add $12.65$ . Added to previous number line, an arc from 1 extending to the right, with label, plus 12.65.
Answer (a):
$13.65$

$4(-5+100)$
Hint (c):
Add what is in the parentheses first, then multiply by 4.
$-212+(-102)$
Hint (d):
Use a drawing as in part (a) to help make sense of this problem.
$4+6(3)+2(5\frac{1}{2}-1)$
Hint (e):
Remember to subtract what is in the parentheses first before multiplying by 2.
More Help (e):
Make sure all multiplication is done before adding.
Answer (e):
$31$
Remember to show how you know your answer makes sen
$5+3(5)+(-4)(5)$
Hint (f):
See part (e).