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.

For which of the following counts would a binomial probability model not be reasonable? a)the number of people in a classroom born in januaryb) the number of people in a classroom with red hair c) the number of people admitted to a hospital in a day with a particular disease d) the number of heart beats in a one-minute perio.

We just started the introduction into circles and i have no idea how to do this.

Segment an is an altitude of right δabc with a right angle at a. if ab = 2, squared 5 in and nc = 1 in, find bn, an, ac.