Somebody help me so I can give y’all some points

What signals you that factoring by grouping is the best method to use when factoring a problem?

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 effect on the graph of the function f(x) = x2 when f(x) is changed to f(x) − 4?