Apolice car's siren operates at a frequency of 2,000 hz. what frequency would a stationary listener observe if the police car is driving towards him at 65 mph? note vsound = fλ, where vsound (the speed of sound in air) is 345 m/s. also, 1 mile = 1.609 km.

The graph of the function f(x) = (x + 2)(x + 6) is shown below. which statement about the function is true? the function is positive for all real values of x where x > –4. the function is negative for all real values of x where –6 < x < –2. the function is positive for all real values of x where x < –6 or x > –3. the function is negative for all real values of x where x < –2.