How old am i if 400 reduced by 4 times my age is 144

How do you find principle and simple interest

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

10x − 5y + 14 = 0 whats the answer pls