If An atom has 10 protons, 11 neutrons, and 9 electrons. What is the atomic number of this atom? A) 9

B) 10

C) 11

D) 21

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(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?

Find the coordinates of point x that lies along the directed line segment from y(-8, 8) to t(-15, -13) and partitions the segment in the ratio of 5: 2.