18.Find the first five terms of the arithmetic sequence with a₁ = 9 and d = -3.

25.You initially have saved $50. Each month you add $10 more to your savings account. create an explicit formula to model the amount you have saved after n months.

42.Calculate the variance for the data set: 2, 2, 4, 6, 6

45.Find the 5 number summary for the data set 36, 74, 38, 70, 42, 69, 47, 62, 51, 56

50.The heights of American men aged 18 to 24 are approximately normally distributed with mean 70 inches and standard deviation 5 inches.Half of all young men are taller than what height?