exam Maths Puzzle Numerical Ability

i also need #16 answered also same chapter, and we are working on rational expressions

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exam Other Question

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? (-3-5)sqrt2+(-4-2)sqrt2 this is supposed to add up to sqrt100 and then into 10 how is this problem done?