exam Maths Puzzle Numerical Ability

Write in simplest form.

x^2 + 6x - 40/x^2 - 100
My answer is x + 4/ x + 10 am I right?

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exam Other Question

(1,1)
A=(0,2) find a matrix B such that C(A)=N(B)
(1,0)

i get that c(a) means column space and n(b) is a null space, but no idea how to d PLEASE SOMEONE HELP ME?
Business and finance. Kevin earned $165 interest for 1 year on an investment of
$1500. At the same rate, what amount of interest would be earned by an investment of $2500?