Which of the following statements is untrue in regard to sound traveling in air? a. sound waves in the air are transverse and consist of compressions and rarefactions of air molecules. b. as the distance from the earth increases, the sound wave intensity also decreases due to the lessening density. c. during a single vibration of the diaphragm, molecules in the air near it will also complete one vibration. d. the area covered by the wave front increases as the wave advances, but the energy passing through a wave front in a unit of time decreases.

just took the test its not "d"

truck y has a greater velocity than truck x.

we have been given a quadratic function and we need to restrict the domain such that it becomes a one to one function.

we know that vertex of this quadratic function occurs at (5,2).

further, we know that range of this function is .

if we restrict the domain of this function to either or , it will become one to one function.

let us know find its inverse.

upon interchanging x and y, we get:

let us now solve this function for y.

hence, the inverse function would be if we restrict the domain of original function to and the inverse function would be if we restrict the domain to .