14. Which of the following equations gives the total voltage in a circuit with three resistors connected in series with one another? Explain your choice a. VI=VI-V2=V 3 b. VT=VI+V2+V3 c. VT= IT/RT d. VT=RT/IT 15. Two flutist play what should be the same note - an A at 440 Hz. Unfortunately, one of the flutes is slightly out of tune and produces a tone at 443 Hz. When sounded together, what beat frequency is heard? Justify your choice with mathematics. b. -3 Hz c. 3 Hz d. 441.5 Hz