book Maths Puzzle Numerical Ability

Two numbers have a sum of 39. Their difference is 11. What are the two numbers. Please show me how to set this problem up. Thank you.

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Can some one please help explain these in detail? I am so lost. Thank you

Factor completely:
9x^2 -16y^2

3x^2-2x-8

3x^2 + 12x +12

Thanks again for all your help!




Thank you i need help with these problems as well please.

x(y+12) divided by 10 (x-y) x=5 and y=-3

would you just plug in 5 for x and -3 for y and you would get 9/16??