A customer on Plan A got a monthly phone bill of $22.50. How many texts did she send? Explain how you know this.

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

If $740 is invested at an interest rate of 11% per year and is compounded continuously, how much will the investment be worth in 7 years? use the continuous compound interest formula a = pert.

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.