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andreev551 [17]
3 years ago
10

Alan bought a new sofa for $800 and used the coupon ‘25% off’. How much did he pay?

Mathematics
1 answer:
Studentka2010 [4]3 years ago
7 0

Answer:

he paid $200

hope this helps you!

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Una ambulancia se desplaza hacia el norte a 23,5 m/s. Su sirena emite un sonido de 500Hz de frecuencia. Calcular la frecuencia a
aliya0001 [1]

Answer:

(I attach your complete question in the picture below)

The apparent frequency 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

4 0
3 years ago
What is the scientific notation for 568 billion?
tresset_1 [31]
5.68x10^11
100=10^2
1 billion=10^9
10^2*10^9=10^11
5 0
3 years ago
How do u show work for this problem
damaskus [11]
Just show how you dived the equation and found the X
3 0
2 years ago
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The slope of a line is2/3 . What is the slope of a line that is perpendicular to this line? A-3/2 B-2/3 C2/3 D3/2
slamgirl [31]

Answer:

i believe it is C

Step-by-step explanation:

4 0
3 years ago
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If sam has 1 gallon of milk and he drinks 4 glass of 8 ounces how many dayswould he have drank the milk gone?
Mariulka [41]

1 gallon = 4 quarts

1 quart = 32 ounces, 1 quart = 32 ounces*1 glass/8 ounces = 4 glasses

1 quart = 4 glasses

1 gallon = 4 quarts = 16 glasses

If Sam drinks 4 glasses per day. and he has 16 glasses, then 16/4 = 4 days

Answer is 4 days.

3 0
3 years ago
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