Angles ABC and DBE are vertical angles. If m A. 180°
B. 38°
C. 52°
D. 128°

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?

Multiply. write your answer in simplest form. 3/8 x 5/7

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)