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givi [52]
4 years ago
15

Alissa has $360 for guitar lessons. She pays $25 for each lesson. How many lessons has she attended, if she still has $85 left?

Mathematics
1 answer:
bagirrra123 [75]4 years ago
7 0

Answer:

11 lessons

Step-by-step explanation:

360-85=275

275/25=11

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PLEASE HELP ME WITH IT.
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OK.  I did it.  Now let's see if I can go through it without
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I think the key to the whole thing is this fact:

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That tells us several things:

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Now look at the right triangle inside the rectangle.
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But  a = b/2, so             (b/2)² + b² = r²

(b/2)² = b²/4                   b²/4   + b² = r²

Multiply each side by 4:     b² + 4b² = 4r²
                                       -  -  -  -  -  -  -  -  -  -  -
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Repeat the
original equation:                a² +  b² =  r²

Subtract the last
two equations:                  -a² + 4b² = 3r² 

Add  a²  to each side:              4b²  =  a² + 3r² .    <=== ! ! !
 
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