Plss help me with this guys pls help I really need it can u help me with all of them plss

If 3x+8=3x+8 is it one solution or no solution

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

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?