4. at a college bookstore, carla purchased a math textbook and a novel that cost a
total of 54, not including tax. if the price of the math textbook, m, is $8 more than 3
times the price of the novel, n, which system of linear equations could be used to
determine the price of each book?
a.
m - n = s
m = 3n - 54
c. m + n = 54
m = 3n + s
b. m = n = 8
m = 3n - 54
d. m + n = 54
m = 3n-s

Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.