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bezimeni [28]
3 years ago
8

X=-2. ㄱ f(x) = 2x-2+5

Mathematics
1 answer:
Paha777 [63]3 years ago
4 0

Step-by-step explanation:

from,

f (x) = 2x-2+5

BUT x=-2

f (x) = 2 (-2)-2+5

= -4-2+5

= -6+5

= -1

so,

f (x) = -1

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Let's say Bailey takes "b" days to paint it.

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\bf \stackrel{\textit{Andrew's rate}}{\cfrac{1}{a}}+\stackrel{\textit{Bailey's rate}}{\cfrac{1}{b}}=\stackrel{\textit{1 day of work}}{\cfrac{1}{7}}
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\cfrac{1}{a}+\cfrac{1}{6a}=\cfrac{1}{7}\impliedby 
\begin{array}{llll}
\textit{let's multiply all by }\stackrel{LCD}{42a}\textit{ to toss the}\\
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\bf 42a\left( \cfrac{1}{a}+\cfrac{1}{6a} \right)=42a\left( \cfrac{1}{7} \right)\implies 42+7=6a\implies \cfrac{49}{6}=a
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\stackrel{days}{8\frac{1}{6}}=a
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b=6\cdot \cfrac{49}{6}\implies b=\stackrel{days}{49}
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