Evaluate y = 3x, when x = 5

y = 243
y = 125
y = 15

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

You are a clerk at convenience store. a customer owes 11.69 for a bag of potatoes chips. she gives you a five dollar bill. how much change should the customer receive?

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?