14. the difference of twice a number and 7 is 9.
15. ten less the quotient of a number and 3 is 6.
16. five times the sum of a number and 4 is –15.

The number of chocolate chips in an 18-ounce bag of chocolate chip cookies is approximately normally distributed with a mean of 1252 chips and standard deviation 129 chips. (a) what is the probability that a randomly selected bag contains between 1100 and 1500 chocolate chips, inclusive? (b) what is the probability that a randomly selected bag contains fewer than 1125 chocolate chips? (c) what proportion of bags contains more than 1225 chocolate chips? (d) what is the percentile rank of a bag that contains 1425 chocolate chips?

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

18 16 11 45 33 11 33 14 18 11 what is the mode for this data set