From one year to the next, the population of a middle school dropped from 680 to 520. Which of the following is closest to the percent that the population decreased?
(1) 12%
(3) 24%
(2) 17%
(4) 31%

What is the value of x in the this question ?

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11

Complete the equation of the live through (-1,6) (7,-2)