Find the value of x
(3x+4) on top
(5x+21) on bottom

Acertain standardized? test's math scores have a? bell-shaped distribution with a mean of 520 and a standard deviation of 105. complete parts? (a) through? (c)

Nine more than four times a number is the same as one less than twice the number. find the number?

Solve the given system of equations. 2y= -x+9 , 3x-6= -15