Melissa and rachel like to make funny hats. melissa has made 20 zebra-printed hats, and rachel has made h striped hats. together they have made a total of 42 hats. write an equation to describe this situation.

Which of the following graphs represents the function f(x) = 2^x

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.

The height of a flare fired from the deck of a ship in distress can be modeled by h(t)= -2(8t^2-52t-28), where h is the height of the flare above water and t is the time in seconds. a. find the time it takes the flare to hit the water.