Can you help me and tell me how to do the math plz

Mathematics

2 answers:

balandron [24]3 years ago

6 0

Answer:

The answer is C = -3

Step-by-step explanation:

If you fill in -3 for all spots in C it turns the equation too 5 - 3 + 4 - 3. 5 - 3 = 2. Then 2 +4 = 6. Then 6 - 3 = 3. How I solved it was I knew it would need to be a negative to get 3 from a 5 + 4. So I tried close options, I first tried -2 did not work, then did -3 and it worked. Hope this helps.

irakobra [83]3 years ago

5 0

Answer:5x3+4

Step-by-step explanation:

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beks73 [17]

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now, if we want a 90% solution, and say we add "y" gallons, how much acid is in it? well (90/100) * y, or 0.9y.

now let's add "x" gallons of pure acid, now, pure acid is just pure acid, so is 100% acid, how much acid is there in it? (100/100) * x, or 1x or just x.

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$\bf \begin{array}{lccclll}
&\stackrel{gallons}{acid}&\stackrel{acid~\%}{quantity}&\stackrel{acid~gallons}{quantity}\\
&------&------&------\\
\textit{pure acid}&x&1.00&x\\
\textit{20\% sol'n}&6&0.20&1.2\\
------&------&------&------\\\
mixture&y&0.90&0.9y
\end{array}
\\\\\\
\begin{cases}
x+6=\boxed{y}\\
x+1.2=0.9y\\
----------\\
x+1.2=0.9\left( \boxed{x+6} \right)
\end{cases}
\\\\\\
x+1.2=0.9x+5.4\implies x-0.9x=5.4-1.2\implies 0.1x=4.2
\\\\\\
x=\cfrac{4.2}{0.1}\implies x=\stackrel{gallons}{42}$

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Answer:

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