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sertanlavr [38]
3 years ago
9

Your cell phone plan costs $39.99 per month plus $.15 for each text message you send or receive. You have at most $45 to spend o

n your cell phone bill. What is the maximum number of text messages that you can send or receive next month?
-What information do you know? What information do you need?
-What inequality can you use to find the maximum number of text messages that you can send or receive?
-What are the solutions of the inequality? Are they reasonable?
Mathematics
2 answers:
Andrei [34K]3 years ago
3 0
100 because 39.99+.15 multiplied by 100 equals 44.99 dollars.

never [62]3 years ago
3 0
1 because 39.99 is 40.00 so if 15.00 is for each text message that means that's ur 45.00
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Step-by-step explanation:

The sum of n terms of geometric sequence can be calculated using formula

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In your case,

S_n=86,830\\ \\r=2.2\\ \\n=4\\ \\a_1=?

Substitute into the formula:

S_4=\dfrac{a_1(1-2.2^4)}{1-2.2}\\ \\86,830=\dfrac{a_1(1-23.4256)}{-1.2}\\ \\-104,196=a_1(-22.4256)\\ \\22.4256a_1=104,196\\ \\a_1=\dfrac{104,196}{22.4256}\approx 4,646.30

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3 years ago
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