B. USE THE PROPORTION FOR THE PERCENT OF CHANGE. 638 580 58 STUDENT...

8. b. Use the proportion for the percent of change. 638 580 58 students is the increase in the num-

58

ber of students. . Cross-multiply to get 580x5,800 and divide each side by 580.x10.

580

100

^x

Therefore, the percent ofincreaseis 10%. The only statement that does not support this is bbecause itimplies that fewer students are taking biology this year.