Let a be a nonzero rational number. Is rational or irrational? Prove your answer by picking a value for a and simplifying the expression. Then explain your reasoning.

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

Find the zeros of each function. f(x) = x^2 + 5x - 6

How do you do the foil method with polynomials?