You have a box of red, yellow, and purple counters. Find the least number of each colour you need to show these two ratios: red:yellow = 4:7
red:purple = 8:9

Diane owes $387 to her brother. if she debits her bank account $161.25 a month to pay him back, how many months will it take her to pay off the debt?

What are the solutions to the equation 4x2+3x=24-x

An initial investment of $100 is now valued at $150. the annual interest rate is 5%, compounded continuously. the equation 100e0.05t = 150 represents the situation, where t is the number of years the money has been invested. about how long has the money been invested? use your calculator and round to the nearest whole number. years