Sometimes when grouping symbols are use to enclose other grouping symbols, we use instead of parentheses or brackets, to make an expression easier to read.

Example: 2{(3 + 5)[2 −(4 + 5)] + 8

Which of the following are accepted without proof in a logical system? check all that apply.

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.

I’m still confused on how to work the percentages