It would hafta be answer choice D
Answer: 20% off
Step-by-step explanation:
35.00 times .20 = 7.00
35.00 minus 7.00 = 28.00
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Answer: 
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3*sqrt(7)
3 times the square root of 7
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Explanation:
I'm assuming the V stands for square root. You can write sqrt(63).

The idea is to factor 63 in such a way that one factor is the largest perfect square possible, that way we can pull the root apart to simplify as shown above. The rule I used for the second step is 
The volume is 10 cubic meters is 6 cenemeters