Who ever answers first gets brainliest

Which expression is equivalent to (9x - 3 1/ + 1 3/8)

What is the missing step in this proof ?

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.