20 customers are eating at a local resturan. of the 20 customers 4 have enough to pay cash, 16 have enough to pay card and 3 have enough to pay cash and card, what is the probability that a customer has enough cash and a creditcard.

Write an explicit formula that represents the sequence defined by the following recursive formula:

How can you decide witch operations to use to slice a two step equation

Alake near the arctic circle is covered by a 222-meter-thick sheet of ice during the cold winter months. when spring arrives, the warm air gradually melts the ice, causing its thickness to decrease at a constant rate. after 333 weeks, the sheet is only 1.251.251, point, 25 meters thick. let s(t)s(t)s, left parenthesis, t, right parenthesis denote the ice sheet's thickness sss (measured in meters) as a function of time ttt (measured in weeks).