Which choice is the same as the difference between a number itself?

What is the approximate circumference of the circle shown below?

Guys i really need or i have to stay late up night

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