How do you write and evaluate numerical expressions?​

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

Abag contains 3 red marbles, 2 blue marbles, and 2 green marbles. one marble is picked, then another marble. assume that the selections are made with replacement. a) find the probability of picking two red marbles with replacement. b) find the probability of picking a red marble and a blue marble. assume the selections are made without replacement. c) find the probability of picking two red marbles without replacement. d) find the probability of picking a red marble and a blue marble without replacement.

240 seventh graders and two-thirds of the students participate in after-school activities how many students participate in after-school activities