Christy bought an 8-foot piece of lumber to trim a bookshelf. altogether, she needs 100 inches of lumber for the trim. did christy buy enough lumber? explain.

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.

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

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.