exam Maths Puzzle Numerical Ability

I am having problems with this problem:

Find f(1) for f(x)= x^3 + x^2 - 1

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exam Other Question

Find the slope of any line perpendicular to the line through points (3,12) and (5,4).

I found the slope of the two points, and then I found the negative reciprocal, which is 1/4.
Is this correct?

Thanks for your help! ->
jk bisects LMJL. mLKJL=4X-7. mLMJL=9X-26.
Find x, mLMJK and mLMJL.
I know its....
(4x-7)+(4x-7)=9x-26
8x-14=9x-26....then what?