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Ann [662]
3 years ago
11

Need Help 20 points plz.

Mathematics
1 answer:
Over [174]3 years ago
8 0

9514 1404 393

Answer:

  the correct choices are shown

Step-by-step explanation:

<u>Statement</u> . . . . . <u>Reason</u>

1. c ║ d; ∠4 = ∠5 . . . . . Given

2. ∠4 = ∠7 . . . . . Alternate interior angles are equal

3. ∠5 = ∠8 . . . . . Vertical angles are equal

4. ∠7 = ∠8 . . . . . Substitution

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How much pure water must be mixed with 10 liters of a 25% acid solution to reduce it to a 10% acid solution?
elena-s [515]

Suppose you add x liters of pure water to the 10 L of 25% acid solution. The new solution's volume is x + 10 L. Each L of pure water contributes no acid, while the starting solution contains 2.5 L of acid. So in the new solution, you end up with a concentration of (2.5 L)/(x + 10 L), and you want this concentration to be 10%. So we have

\dfrac{2.5}{x+10}=0.1\implies25=x+10\implies x=15

and so you would need to add 15 L of pure water to get the desired concentration of acid.

8 0
3 years ago
1/4x + 3/4 = 1/2 ??????????
mart [117]

Answer:

x = -1

Step-by-step explanation:

1/2 = 2/4

____________________________________________________________

1/4x + 3/4 = 2/4

<u>         -3/4     -3/4</u>

1/4x = -1/4

divide by -1/4

x = -1

<em><u>Hope this helped! Have a nice day! Plz mark as brainliest!!!</u></em>

<em><u>-XxDeathshotxX</u></em>

4 0
3 years ago
What is x<br> 7x-21=4x-36
soldier1979 [14.2K]

Answer:

x = -5

Step-by-step explanation:

5 0
3 years ago
How do I do this? I don’t understand
Ganezh [65]
You have to input the 5 into the x place. so it would be y=3(5) and you get the answer y=15
5 0
3 years ago
Read 2 more answers
 Abbey is adopting a kitten. Abbey has a rectangular container to bring the kitten home in. The container has a volume of 3,100
solniwko [45]
  • L=10.6in
  • H=15.6in
  • B=?

\\ \rm\Rrightarrow V=LBH

\\ \rm\Rrightarrow 3100.5=10.6(15)B

\\ \rm\Rrightarrow 3100.5=159B

\\ \rm\Rrightarrow B=\dfrac{3100.5}{159}+19.5

5 0
2 years ago
Read 2 more answers
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