A bag contains 3 red 4 white and 5 black balls, what is the probability of getting one black ball. O 3/12, 1/12. O 4/12. or 5/12​

Let r = 3. what is the value of r + 58?

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

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me