Identify and then combine the like terms to create equivalent expressions. 1) 9 + 7 +2z-z

2) 20 + 3x -4y

3)13+22x - 5

Brainliest goes to the explaination. Thank you!

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?

How to use order of operation in 20 divide by 4 multiply 5 = 1

Solve the system of equations using the substitution method. {y=−3x+7x=−2y−16 enter your answers in the boxes.