According to the Rational Root Theorem, which statement about f(x) = 12x3 – 5x2 + 6x + 9 is true

Is this a polynomial function? i need to know asap

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%