Simplify the expression.
15 - [(8-3)+(12-21)]2
15 - [(8 - 3) + (12 - 21)? =(

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

Which of the points a(6, 2), b(0, 0), c(3, 2), d(−12, 8), e(−12, −8) belong to the graph of direct variation y= 2/3 x?