Turn 5/7 into its smallest form

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?

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 best explains why this triangle is or is not a right triangle ?