book Maths Puzzle Numerical Ability

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

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book Other Question

add and simplify

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

please show work
Solve each equation for y.
y + 1/2 = -1/3 (x + 1/2)


ISBN: 13-978-0-07-326862-0