exam Maths Puzzle Numerical Ability

decide whether lines p1 and p2 are perpendicular:

line p1:x+8y=-4
line p2:4x-2y=10

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exam Other Question

How many positive real solutions are there in:

f(x) = -2x^4 + 3x^3 + 7x^2 + 2

a. 0
b. 2
c. 1
d. None, there is no x-term
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