An ambulance is traveling north at 64.4 m/s, approaching a car that is also traveling north at 33.7 m/s. The ambulance driver hears his siren at a frequency of 554 Hz.
At what frequency does the driver of the
car hear the ambulance’s siren? The velocity
of sound in air is 343 m/s. Answer in units of Hz.

Answer is in the photo. I can't attach it here, but I uploaded it to a file hosting. link below! Good Luck!

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the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2