.75x=480
divide by. 75
640 people total surveyed
Answer:
y - 2 = 2(x - 3).
Step-by-step explanation:
The point -slope form of a line is:
y - y1 = m(x - x1) where m = the slope and (x1, y1) is a point on the line.
Here m = 2, x1 = 3 and y1 = 2. So we have the equation:
y - 2 = 2(x - 3).
Answer:
Just substitute values for x in such as 1,2,3,4 and 5 for the both the equations
Step-by-step explanation:
16 because you have to go 12 units from -8 to 4, so you go 12 from 4 and get 16
Answer:
The apparent frquency would be
f' = 493.26 Hz
Step-by-step explanation:
This a Doppler's effect problem. This effects produces a slight change in the frequency of a traveling wave, due to the effect of the velocity of the receiver (observer).
The formula used to describe the change, as both vehicles are moving away of each other:
f' = [ (Vwave + Vobserver) / (Vwave + Vsource ) ]*f
Where
Vwave = 340 m/s ( speed of sound)
Vobserver = 18.6 m/s (observer = car)
Vsource = 23.5 m/s (speed of the ambulance = source)
f = 500 Hz (frequency of the sound)
We just need to substitute in the equation
f' = [(340+ 18.6) / (340+ 23.5)] * 500 Hz
f' = [0.9865] * 500 Hz = 493.26 Hz
f' = 493.26 Hz