Find the mean of these numbers:
2,57, 38, 42,6

Multiplying an even number of negative numbers gives an answer that is choose from:

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 perimeter of an isosceles triangle with each leg measuring 2x+3 and the base measuring 6x-2?