A 420$ dressed is 20% off, how much is the sales price?

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?

Sketch one cycle if the cosine function y=2cos2theta

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?