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

find a linear fucntion g given (-1/4)=-6 and g(2)=3 answer g(x) I need help with all steps for Cramer's Rule on the problem

4x+3y+2z=6
-2x-y+5z=5
x+2y-3z=3

thank you very much I am very confused about this