Answer: 24?
Step-by-step explanation: I am not 100% Its been a while since I used my math properties
What you have to do is divide 35 by 5 to find one fith. You can see that one fith of the class is 7 so 14 pupils in the class is boys.
Step-by-step explanation:
there are 2 girls
total of 5 people
probability is 2/5 which is 0.4 and 40%
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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 