Answer:
the answer is C
give the comments brainlest
Step-by-step explanation:
7.158 * 10^9 rounds to 7 * 10^9
7 * 10^9 = 7,000,000,000
First, u multiply 8x3. Only the 4 can go in the ones place so put the four beneath the line and put the 2 over the 7.
Multiply 8x7 and add 2.
Move to the tens place, do 2x3 then 2x7.
Add the products and put the comma. Then ur done
Answer:



This might not be correct though. I'm only in middle school lol. I am sure about the last one.
It is m + 9 because if we let m = 60 and the lest was 9 minutes longer than m, the test would be 69 minutes long. Therefore the answer is m + 9