What is the proportion of this give me steps

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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.

Mackenzie needs to determine whether the rectangles are proportional. which process could she use? check all that apply.

Opposite angles in a parrellelogram are