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2 years ago

9

Does anyone under stand this one ??

2 answers:

Annette [7]2 years ago

5 0

Answer:

its c i belive'

Step-by-step explanation:

Neko [114]2 years ago

5 0

It’s c I believe maybe maybe try okkk

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Step-by-step explanation:

Let

x -----> the number of polyphonic ringtones

y ----> the number of standard ringtones

we know that

$x+y=7$

$x=7-y$ -----> equation A

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Solve the system of equations by substitution

Substitute equation A in equation B and solve for y

$3.25(7-y)+1.50y=21$

$22.75-3.25y+1.50y=21$

$3.25y-1.50y=22.75-21$

$1.75y=1.75$

$y=1\ standard\ ringtones$

Find the value of x

$x=7-1=6\ polyphonic\ ringtones$

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