How do you find the length of arc and area of sector

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

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

Which graph represents the equation y =4x