What is AB
what is BC
what is AC/AB

please include an explanation too

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2

Three resistors are connected in series across a 15-v power supply. if the potential drops across resistors 1 and 2 are 4.1 volts and 3.1 volts, what is the exact potential drop (in volts) across resistor 3?