A drop of water falls from a window ledge 100 feet above the ground. The solution to the equation 100 - 16t2 = 0 gives t, the number of seconds it takes for the drop to reach the
ground. How long does it take the drop to reach the ground?

How to do this , and can some one explain

The value of cos 30° is the same as which of the following?

Finally, the arena decides to offer advertising space on the jerseys of the arena's own amateur volley ball team. the arena wants the probability of being shortlisted to be 0.14 what is this as a percentage? what is this as a fraction? what is the probability of not being shortlisted? give your answer as a decimal.