Which ratios are in a proportional relationship?
2 to 5 and 4 to 16
2 to 3 and 4 to 6
4 to 5 and 10 to 15
4 to 5 and 8 to 12

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 graph of f(x) = |x| is transformed to g(x) = |x + 11| - 7. on which interval is the function decreasing?

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2