Solve each system by elemination, 4x+8y=20 and -4x+2y=-30

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

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

Solve the problem by making up an equation. a man could arrive on time for an appointment if he drove the car at 40 mph; however, since he left the house 15 minutes late, he drove the car at 50 mph and arrive 3 minutes early for the appointment. how far from his house was his appointment?