4. The usual 110-V household alternating current varies from –155 V to 155 V with a frequency of 60 cycles/ sec ( frequency is the reciprocal of period ). Assume the current
starts at rest and then rises.

Which system of linear inequalities is represented by the graph? !

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?

Tamera puts 15/4 gallons of gasoline in her car. which mixed number represents the gallons of gasoline? a) 2 3/4 gallons b) 3 1/4 gallons c) 3 3/4 gallons d) 4 1/2 gallons answer it's worth a lot of points!