The area of a rectangular classroom is 320 square feet. if the length and width of the classroom are multiplied by 4, what is the area of the new classroom?
a) 5120
b)2540
c) 1700
d)3840

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.