Ik this is the 2nd irregular figure question already but...halp

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

Ineed with number 6 , explain how to get 1978

Find the value of x. round the length to the nearest tenth