Simplify (long algebra problem w/exponents)

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent ?

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

The price of a visit to the dentist is calculated according to the formula 50+100n50+100n where nn is the number of cavities the dentist finds. on your last visit to the dentist, 22 cavities were found. what was the cost of your visit?