Please please please help me

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

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.

Me. i can't figure out this question. give an explanation too. .