Suppose x has a distribution with a mean of 80 and a standard deviation of 44. Random samples of size n = 64 are drawn. Find P(x bar < 91).

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

The table shows the balance of a money market account over time. write a function that represents the balance y(in dollars) after t years.

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota