A wave has the following properties: amplitude = 0.298 m, period = 0.824 s, wave speed = 15.1 m/s. The wave is travelling in the -x direction. What is the equation for the wave? y = __ *sin ( __ * t + __ * x )

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.