The heights of 15-year-old American boys, in inches, are normally distributed with mean and standard deviation I select a simple random sample of four 15-year-old American boys and measure their heights. The four heights, in inches, are 63 69 62 66 12. Based on these data, a 99% confidence interval for , in inches, is a. 65.00 1.55. b. 65.00 2.35. c. 65.00 3.09. d. 65.00 4.07.

Adaycare center charges a $75 enrollment fee plus $100 per week. which of the following represents the cost of sending a child to daycare for 14 weeks?

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.