Mary is x years old. how old will she be in 11 years ? how old was she 5 years ago ?

Solve |x| > -9 a) {x|x< -9 or x> 9} b) all reals c) no solution

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 is the focus of a parabola with equation y2=4x