How many rooms can the electrician do

just 2 more problems and i will stop posting questions (for now)

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?

Factor x2 – 8x + 15. which pair of numbers has a product of ac and a sum of what is the factored form of the

Which one ? is the answer and how to find this answer