What is 30% of of 550 dollars

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?

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)