exam Maths Puzzle Numerical Ability

2/y-4^y=?

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exam Other Question

How would I set up the following problem to solve correctly? Write in lowest terms and for what value(s) of x is the fraction not defined? This is in the rational expressions chapter of the book.

x^2+3x
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x^2+7x+12 Could someone please show me how to multiply and then simplify this expression. I have a few other problems like it and I am not sure how to solve it.
sqrt 13 * sqrt 5
I understand that by multiping 13 * 5= sqrt 65
How do I simplify this????