exam Maths Puzzle Numerical Ability

It has been along time since I dealt with these. But I need your help.

Find the additive and multiplicative inverses of each of the following:
a) 3
b) -2/3
c) 2.5 X 10^-3

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exam Other Question

decide whether lines p1 and p2 are perpendicular:

line p1:x+8y=-4
line p2:4x-2y=10 use properties of logarithms to expand each logarithmic expression as much as possible. where possible, evaluate logarithmic expression without using a calculator
log^b x^7