What does factor this expression mean 8w - 18

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?

You deposit $5000 each year into an account earning 3% interest compounded annually. how much will you have in the account in 30 years?

The function below show how much jayna and hannah charge for babysitting. which statement best compares the two plants?