Explain why you might not want to use the variables "x" or "o" when solving a word problem

Barbara deposited $300 in the bank. if the bank pays her simple interest at the rate of 4 percent per year, how much money will she have in her account at the end of 9 months?

Acompany charges $0.10 for each letter engraved. bobby plans to spend no more than $5.00 on the engraving on a jewelry box. write and solve an inequality to find the maximum number of letters he can have engraved.

Use the quadratic function to predict f(x) if x equals 8. f(x) = 25x2 − 28x + 585