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snow_lady [41]
3 years ago
11

What is the distance between (0, 0) and

Mathematics
1 answer:
sp2606 [1]3 years ago
6 0

Answer:

C. 17

Step-by-step explanation:

Distance formula:

\sqrt{(x_2 - x_1)^{2} +  {(y_2 - y_1)}^{2}  }  \\  \\ =   \sqrt{ {(8 - 0)}^{2} + ( {15 - 0})^{2}  }  \\  \\   = \sqrt{ {(8)}^{2}  +  {(15)}^{2} }  \\  \\  =  \sqrt{64 + 225}  \\  \\  =  \sqrt{289}  \\  \\  = 17

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3 years ago
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A chemist wishes to mix a solution that is 6% acid. She has on hand 14 liters of a 4% acid solution and wishes to add some 10% a
jonny [76]

she should add 7 liters of 10% acid solution

Explanation

Step 1

set the equation:

a) let X represents the amount os solution that is 4% acid

let Y represents the amount os solution that is 10% acid

so

I)

\begin{gathered} \frac{4}{100}X+\frac{10}{100}Y=\frac{6}{100}(x+y) \\  \end{gathered}

if he has 14 liters of 4% acid solution

x=14

\begin{gathered} \frac{4}{100}X+\frac{10}{100}Y=\frac{6}{100}(X+Y) \\ \frac{4}{100}*14+\frac{10}{100}Y=\frac{6}{100}(X+Y) \\ 0.56+0.1Y=0.06(14+Y) \\ 0.56+0.1Y=0.84+0.06Y \\  \end{gathered}

Step 2

solve the equation :

\begin{gathered} 0.56+0.1Y=0.84+0.06Y \\ subtract\text{ 0.06Y in both sides} \\ 0.56+0.1Y-0.06Y=0.84+0.06Y-0.06Y \\ 0.56+0.04Y=0.84 \\ subtract\text{ 0.56 in both sides} \\ 0.56+0.04Y-0.56=0.84-0.56 \\ 0.04Y=0.28 \\ divide\text{ both sides by 0.04} \\ \frac{0.04Y}{0.04}=\frac{0.28}{0.04} \\ Y=7 \end{gathered}

therefore,

she should add 7 liters of 10% acid solution

I hope this helps you

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seropon [69]

Answer:

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Step-by-step explanation:

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