Can someone explain to me by steps on how to do this?

What is the 9th term in the geometric sequence described by this explicit formula? an=-6. (2)(n-1) apex

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?

Which equation represents a direct linear variationa. y=x2b. y=2/5xc. y=1/xd. y=x+3