exam Maths Puzzle Numerical Ability

Please help me to solve my homework question. thanks!

Write in lowest terms


25x^2-16/15X^3+7x^2-4x

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exam Other Question

A horse and a cow togather cost $800.the horse is sold a a profit of 10% and the cow t loss of 10%.If the total profit of 2.5% is made,what is the cost price of the horse? multiply

(6+2i)^2