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mr_godi [17]
2 years ago
6

your cellphone plan costs 29.99 per month plus 0.18 for each text message you send or receive. you have at most $34 to spend on

your cell phone bill. what is the maximum number of text messages you can send or receive next month.
Mathematics
1 answer:
ioda2 years ago
5 0

Answer:

22.28

Step-by-step explanation:

the inequality would be 29.99+0.18x≤34 because 29.99 is the constant. and the 0.18 is the 'slope' if this were being graphed. and it and it can be equal to but no more than $34.

you subtract 29.99 from both  sides

0.18x=4.01

divide by 0.18

x≤22.28

but you cant send a partial text so it rounds down to 22

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3 years ago
In 1975 1000 tons of coal was manufactured. It is 10% greater in 1976 and 5% less in 77. What is the final about of coal in 1977
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\bf \begin{array}{ccllll}
coal&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
1000&100\\
x&100+10
\end{array}\implies \cfrac{1000}{x}=\cfrac{100}{100+10}\implies \cfrac{1000\cdot 110}{100}=x
\\\\\\
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well, in 1976 it was 1100 tons then, and in 1977 it went down by 5% of 1100, well, if we take 1100 to be the 100%, then what is a 5% decrease?

\bf \begin{array}{ccllll}
coal&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
1100&100\\
x&100-5
\end{array}\implies \cfrac{1100}{x}=\cfrac{100}{100-5}\implies \cfrac{1100\cdot 95}{100}=x
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