Write this as an expression using a negative exponent other than -1

An angle that measures between 90 and 180° is called a(,

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 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83