Hi! This is my mixed semester review for Physics. Can you pls help me understand and answer these 5 questions. Answers should be rounded to the hundredths place. Thank you!!! :)

Normal No Spacing Heathrig 1 Harding 2 Title 15. Calculate the voltage between B & D given the following Information: the battery is 56 V, R, Is Calculate the voltage between B & D given the following information: the battery Is 56 V, R1 Is 14 ohms, R2 is 49 ohms, and Re is 17 ohms. B R3 18. Calculate the current running through point C given the following information: the battery Is 29 V, R1 is 4 ohms, R2 is 7 ohms, and R3 is 12 ohms. A 19. Calculate the resistance of of R, given the following information: the battery is 13 V, R2 is 8 ohms, R. is 12 ohms, and the total current in the circuit is 10. 20. A tuning fork is played over a tube partially filled with water, the length of the pipe in the air is 1.42 m. What is the frequency of the second harmonic that resonates in the tube? Assume the speed of sound to be 348. 21. The following standing wave is formed in a pipe closed at only one end. If the length of the pipe is 0.88 m and the speed of sound is 350 m/s, calculate the wavelength. XX