Please please help me!!

Standard deviation of 19,29,21,22,23

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.

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cot of 61.6