Answer: A
Step-by-step explanation:
The answer is B because reread the question
If you use/make a number line, then you will see that the answer is -18 or a. When using a number line, negative = ← and positive = →.
Answer:
5.25 + 2.50 = 7.75. 10 - 7.75 =2.25
Step-by-step explanation:
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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 