Whats the opposite of -2.4

Pls will give brainliest and all p.s u can zoom in if u cant see plss

Negative 5 1/12 + negative 4 1/4 + 6 3/4

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.