Tyler buys 2 pairs of shoes every year. which of the following expressions shows the total number of shoes he buys in z years? 2 + 2z fraction z over 2 2 + z 2z

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?

Which expression is not a polynomial?

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1