exam Maths Puzzle Numerical Ability

Find the polynomial that represents the volume of the rectanglar solid.
(x+2)(x+4)(x-5)

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exam Other Question

Could some help me please. I am not to sure about dividing two rational expressions.
(x^2 +18/3)/ (x-36/3)
I want to thank you for your help. The formula for calculating the amount of money returned for deposit money into a bank account or CD (Certificate of Deposit) is given by the following:
A=P(1+r/n)
A is the amou