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The correct answer is 20.
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Answer:

Step-by-step explanation:
When you multiply two exponents together with the same base, the exponents get added
Here the base is the same ie b
So 
The constants multiply in the usual sense so 7(-9) = -63
Answer is 
Answer:
$45
Step-by-step explanation:
Answer:
Option C, 5
Step-by-step explanation:
<u>Step 1: Make an expression</u>
Negative five is subtracted from a number the result is 10
n - (-5) = 10
<u>Step 2: Combine</u>
n - (-5) = 10
n + 5 = 10
<u>Step 2: Subtract 5 from both sides</u>
b + 5 - 5 = 10 - 5
n = 5
Answer: Option C, 5