Can you help me with this?

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?

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

What is the area of the triangle 10 13 12