Find the vertex for quadratic function y=2x^2-20x+10

Find the area of the regular hexagon if a side is 20 cm.

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.

Is the number 128.439 a rational number