I need help with question 24,25

Ten times the square of a non-zero number is eqaul to ninety times the number

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.

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*