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Oduvanchick [21]
3 years ago
9

You start with $15 and save $8 each week. What algebraic expression models models the total amount you save ? A. 8+15w B. 15-8w

C. 15+8w D. 23w
Physics
2 answers:
USPshnik [31]3 years ago
8 0
The answer would be C) which is 15+8W
where W represents week, so since you already had fifteen dolor where 8 is the value you save each week.

Ugo [173]3 years ago
7 0

Answer:

C. 15+8w    

Explanation:

Initial amount = $15

Let the number of weeks in which savings are done be 'w'

Savings per week = $8

The total amount would be the sum of the initial amount and the product of the $8  and the number of weeks in which savings were done :

Thus, algebraic expression would be: 15+8w    

correct option is C.

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Alex

Answer:

The amplitude  is  A =  90.2 \ m

Explanation:

From the question we are told that

    The frequency of when sound is approaching observer is   f = 392 Hz

     The frequency as the move away from observer  is  f_ a =  330 \ Hz

    The time between the pitch are t =  10 \ s

Here you are the observer and your friends are the source of the sound

The period is mathematically evaluated as

       T =  2 t

as it is the time to complete one oscillation which from on highest pitch to the next highest pitch

Now T can also be mathematically represented as

          T = \frac{2 \pi}{w}

Where  w is the angular velocity

=>   \frac{2 \pi}{w}  =  2 * 10

=>   w =  0.314 \ rad/sec

Now using Doppler Effect,

   The source of the sound is approaching the observer

The

          f = f_o (\frac{v}{v- wA} )

         392  = f_o (\frac{v}{v- wA} )

Where A is the amplitude

    So when the source is moving away from the observer

         f_a =  f_o (\frac{v}{v+ wA} )  

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Here  f_o is the fundamental frequency

Dividing the both equation  we have

           \frac{392}{330}  =  \frac{f_o(\frac{v}{v-wA} )}{f_o(\frac{v}{v+wA}}

           1.1878  = \frac{v+wA}{v-wA}

         1.1878 v -  1.1878 wA = v+wA

        1.1878 v = 2.1878 wA

=>     A =  \frac{(0.1878 * (330))}{(2.1878)* (0.314)}

         A =  90.2 \ m

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