John's age is 9 more than three times Rick's age. Which expression represents this? a. 3 x + 9
b. 9 + x + 3
c. 9 x + 3

What is not true about kl and mn? what is mn? (show your work)

Having a hard time understanding this question (see attachment).

The number of chocolate chips in a bag of chocolate chip cookies is approximately normally distributed with a mean of 12611261 chips and a standard deviation of 118118 chips. (a) determine the 2626th percentile for the number of chocolate chips in a bag. (b) determine the number of chocolate chips in a bag that make up the middle 9696% of bags. (c) what is the interquartile range of the number of chocolate chips in a bag of chocolate chip cookies?