What is the sum of the cards card one-9 card 2 is 4 card 3 is -3 card 4 is 2

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

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?

The parabola opens: y=√x-4 (principal square root) up down right left