exam Maths Puzzle Numerical Ability

If f(x)=3(1/125)^(x-2)+12 , then what is the value of x when f(x)=87?

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exam Other Question

A circular sheet of paper of radius 6 cm is cut into three equal sectors, and each sector is formed into a cone with no overlap. What is the height in centimeters of each cone? find the slope of the line determined by each equation.

3x=4y-2