Hi my name is isabella and i have a question on what is 2 plus 2

Answer this question! 30 points and brainliest!

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?

Nine more than four times a number is the same as one less than twice the number. find the number?