30 Points!

I need help with these 3 questions.
Thank you!

7(x - 2) = 3(x + 4) solve the following equation. then enter your answer in the space provided using mixed number format.

Suppose a pendulum is l meters long. the time,t,in seconds that it tales to swing back and forth once is given by t=2.01

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?