The sum of negative eighteen and a number is eleven. what is the number?

which equation could be used to solve the problem?

a) x - 18 = 11
b) 18 - x = 11
c) -x + 18 = 11
d) x + 18 = 11

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?