(2x-1)(x+4) expand and simplify

Suppose a least-squares regression line is given by modifyingabove y with caret equals 4.302 x minus 3.293. what is the mean value of the response variable if xequals20?

Find the distance from the theater to the library. leave your answer in simplest radical form if necessary. 12 √12 74 √74

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?