Write an equation to solve the following. show all your work, including the steps for solving the equation and checking your answer.
–4 times a number plus 16 is –116. find the number.

Can someone me out here number 4 plz

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.

Precalculus question, image attached.