A professor compares the number of students at his school majoring in statistics, engineering, both, or neither. He then narrows his study to focus on students just majoring in statistics, engineering, or both. How has he changed the population?​

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.