Bill keeps 15 % oh his vacation spending money in his wallet. he leaves his remaining money ($400) in the hotel safe. about how much money did bill bring on vacation? i just need the equation you don’t need to solve the problem.

Marion has a bicycle that she is planning to take for a ride. the rim of the rear wheel lies 41 cm from the center of the wheel. the tire itself has a thickness of 3 cm. in order for marion to ride her bicycle 96,712 cm approximately how many rotations will the rear wheel make?