Write the following logarithmic expression as a single logarithm with coefficient 1.
log9 - 2logk

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 two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

Cody ran nine miles on his first day of training. the next day he ran 1/8 that distance. how far did he run the second day?