What is the probability of rolling a 2 or a 4 on a standard 6-sided die?

What is the value of r of the geometric series?

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?

What is the solution to the equation below? 3/x-2+6=square root x-2 +8