If my radius is 7.8 maters. what is the circumference and area of my circle

1. what is the measure of ∠abc? what is the measure of ∠abd?

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

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