HELP ASAP / GEOMETRY

The inner radius of the circle below is 2 cm. What is the outer radius?

What is (28 + 7 + 6 + 3) x 1/2 show your work

What is the definition of exponential decay?

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