Do I multiply to solve

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

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

Why is it so easy to buy on impulse and overspend with a credit card? what could you do to counteract this tendency?