Question 2. 2 Which function is NOT linear?
Ar+ 7 = y
B}x=y
C x + y - 20 = 2x
D y = 30 - 2

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Carl's candies has determined that a candy bar measuring 3 inches long has a z-score of +1 and a candy bar measuring 3.75 inches long has a z-score of +2. what is the standard deviation of the length of candy bars produced at carl's candies?