exam Maths Puzzle Numerical Ability

I don't have a problem to solve I just need some information on a couple of questions I have:
1) How do you compute the intercepts of a quadratic function?

2) What is the numbe

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exam Other Question
What is the square root of 3sqrt7/12? How do you convert .72 1/3 into a percent and a decimal. I think it is in fraction form. But I did not consider the decimal in front of 72.