mrs smith had 27 students in her class last year and this year she had 30 students in her math class. what is the percentage change

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Liz is shipping a package to her friend.the maximum weight of a medium flat-rate box is 20 pounds,including the box which weighs 6 ounces.write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.

Which of the following graphs could represent a cubic function?