2. Which of the following is an example of a set of like terms?
a. {19y, 19, y}
b. { 18, -X, 21x}
c. {15, 20, 25y}
d. {-2x, -2y, -2xy}

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?

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

Find the maximum value of p= 4x + 5y subject to the following constraints :