A random sample of 50 mathematics grades out of total of 200 showed a mean 75 and a standard deviation of 10. what are the 95% confidence limit for estimates of the mean of the 200 grades?​

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

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.

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?