A stadium floor that is in the shape of a circle has a diameter with a length of 50 yards. What is the area of the circle on the stadium floor?

Me because some of question i don’t understand

The krasnapolski is a top-of-the-line hotel in amsterdam, the netherlands. among their many services, they rent bicycles to guests. the bicycle checkout is open 24 hours per day 7 days per week and has 50 bicycles on hand. on average, 10 guests request a bicycle each day, arriving completely randomly at all times of the day during the spring and summer seasons. guests keep bicycles for four days on average, with a standard deviation of two days. how long does a guest on average have to wait for a bike? a. approximately 24 hours b. approximately 0.033 hours c. approximately 4 days d. approximately 47 minutes

The candy store is having a 30% off sale. emma is going to buy $7.50 worth of candy.how much will she pay after the discount