In a certain lottery must correctly select 4 numbers in any order out of 36to win

Ineed in figuring out this problem.

Awater truck is filling a swimming pool. the equation that represents this relationship is y=19.75x where y is the number of gallons of water in the pool and x is the number of minutes the truck has been filling the pool.

The perimeter of a quarter circle is 14.28 miles. what is the quarter circle's radius?