Hey plz help ill give brailiest

Two parallel lines are crossed by a transversal. what is value of x

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?

Which term best describes the association between variables a and b