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Mathematics

1 answer:

allochka39001 [22]3 years ago

4 0

Answer:

5(2x + 6) = -4(-5 -2x) + 3x

10x + 30 = 20 + 8x + 3x

10x + 30 = 20 + 11x

Applying the additive inverse property, we get,

10x + 30 - 10x - 20 = 20 + 11x - 10x - 20

10 = x

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Step-by-step explanation: Hope correct :)

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A metallurgist has an alloy with 5% titanium and an alloy with 30% titanium. He needs 100 grams of an alloy with 15% titanium. H

andrey2020 [161]

Let us convert the percentages to decimal format first.. so 5% is just 5/100 or 0.05 and 15% is just 15/100 or 0.15

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$\bf \begin{array}{lccclll}
&amount&concentration&
\begin{array}{llll}
concentrated\\
amount
\end{array}\\
&-----&-------&-------\\
\textit{5\% alloy}&x&0.05&0.05x\\
\textit{30\% alloy}&y&0.30&0.3y\\
-----&-----&-------&-------\\
mixture&100&0.15&15
\end{array}
\\\\\\
\begin{cases}
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----------\\
0.5x+0.3\left( \boxed{100-x} \right)=15
\end{cases}$

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romanna [79]

Answer:

$\large \boxed{27 \, \%} }$

Step-by-step explanation:

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