2. A random sample of the costs of repair jobs produces a mean of $127.95 and a standard deviation of $24.03. If
the size of this sample is 40, which of the following is an approximate 90 percent confidence interval for the
average cost of a repair at this repair shop?

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.

The suare root of 9x plus 7 plus the square rot of 2x equall to 7

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?