How to solve y=2e^0.4t using the properties of exponents to rewrite

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?

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Which of the choices shown could be used to prove that aacp=abcp ?