A skydiver descends at 20 1/3 kilometers per hour after deploying its parachute. Which of the following expressions represents the change in the skydiver's altitude if they descend for 4/7 of an hour?

Fredrick designed an experiment in which he spun a spinner 20 times and recorded the results of each spin

Measures of the angle of r, 31 s (x+4) t (3x+9)

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?