book Maths Puzzle Numerical Ability

add and simplify

y over y^2-49 + 7 over y^2+8y+7

please show work

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book Other Question

half of a number and nine is 15 Please help with this problem. (4x)^3(8x^-5)
I know that the ^3 means to multiply 4x times 4x times 4x.
In the second part, I believe the 8 does not get multiplied by the ^-5, o