What are the zeros of the quadratic function f(x) = 2x2 – 10x – 3?

What value of x is in the solution set of –5x – 15 > 10 + 20x?

Can someone me with this problem i don't understand i need

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.