Round to the nearest ten, to the nearest hundred , to the nearest thousand, and to the nearest ten thousand

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

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.