exam Maths Puzzle Numerical Ability

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?

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exam Other Question

Write in simplest form.

x^2 + 6x - 40/x^2 - 100
My answer is x + 4/ x + 10 am I right?
Find the midpoint of the line segment from A(-2,9) to B(4,5). I plotted it out to be D(3,7) and would like to know if I was right or not. thanks for looking it over.