11. Which of the following sequences are arithmetic? Select all that
apply.
A. 4, 1, -2, -5, -8,...
B. 9, 10, 11, -12, ...
C. 1.0, 1.2, 1.4, 1.6, ...
D. 1,1 1 1

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 of the choices shown could be used to prove that aacp=abcp ?

Which letters from the table represent like terms? a and b b and c a and d b and d