What is the value for x 6x +10= -2

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?

Simplify the expression. -2/5(10+15m-20n)

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8