Use addition to solve the linear system of equations. left
2x+y=3
8x+5y=7
right.

(4,-5)
(-4,-5)
(-4,5)
(4,5)

Cam bought some used books for $4.95. he paid $0.50 each for some books and $0.35 each for the others. he bought fewer than 8 books at each price. how many books did cam buy?

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?

Divide. write in the simplest form. 4 1/6 divided by 10