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%

Don't know how to find x given these segment lengths

Agraphic designer created a logo on eight and a half by 11 inch paper. in order to be placed on a business card, the logo needs to be one and 7/10 inches by 2 and 1/5 in. what is the scale factor of the dilation

You have 12 balloons to blow up for your birthday party. you blow up 1/3, and your friend blows up 5 of them. what fraction of the baloons still need blowing up