I need help with this

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.

Find │7│. a. 1 over 7 b. –7 c. 7 asap i always mark brailiest who me so

What are the solutions of the equation x4 + 6x2 + 5 = 0? use u substitution to solve.