What best describes the number 5?

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?

A(t)=728(1+0.04)^t how much money did aditya originally invest

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.