exam Maths Puzzle Numerical Ability

What is a requirement of the coefficients of a polynomial in order to use the Rational Zero Theorem?
a)That they are all non-negatives
b)That they are all integer values
c)That

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exam Other Question

Walt made an extra $9000 last year from a part-time job. He invested part of the money at 9% and the rest at 8%. He made a total of $770 in interest. How much was invested at 8%? Please show all work.... Solve the equation 3^x+1=27^x+3