When is the sum of two negative mixed numbers an integer

Use set buikder notation to represent the following set: {, -2, -1, 0}

You can find the constant of proportionality by finding the ratio of

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.