Yesterday, 170 guests at a hotel called for room service out of 425 guest. What percentage of the guests at the hotel called for room service yesterday?

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.