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3 years ago

9

Stacy owes 13.65 for text messging in the month of September if her text messaging plan cost 12 for the first 300 messages and 5

c for each text message how many text messages did she send that month

1 answer:

lara [203]3 years ago

7 0

Answer:

need points

Step-by-step explanation:

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3 years ago

9x - y = 15 2x + 8y = 28

faust18 [17]

9x - y = 15
2x + 8y = 28

Use the substitution method.
Solve for y in the first equation.

9x - y = 15
-y = 15 - 9x
y = -15 + 9x

Now plug in y into the second equation.
2x + 8(-15 + 9x) = 28
2x - 120 + 72x = 28
74x - 120 = 28
74x = 148
x = 2

Plug x back into the rewritten first equation.
y = -15 + 9(2)
y = -15 + 18
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3 years ago

I think I'm struggling to find the inverse for this one:

USPshnik [31]

Recall that the derivative of a constant is 0.

$\bf y=x^2-4x+4\implies y=(x-2)^2\implies \stackrel{inverse}{x=(y-2)^2}
\\\\\\
\sqrt{x}=y-2\implies \sqrt{x}+2=y\implies x^{\frac{1}{2}}+2=y
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3 years ago

IceJOKER [234]

Answer:

I would say d.im pretty sure tho

6 0

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