If a coin is flipped three times what is the probability of getting heads at least twice. AND PLS HELP I NEED ANSWERS FOR A 21 PROBLEM MATH TEST I Am WELLING GIVE HECK OF POINTS FOR THIS And PLS GIVE RIGHT answers I been HAVING ALL F’s FOR 3 SERMERTS PLS HELP ME OUT GUYS and I keep leaving questions

Question 5 spring semester final exam math evaluate

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?

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning