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Finger [1]
3 years ago
12

A laboratory technician needs to make a ​81-liter batch of a ​20% acid solution. How can the laboratory technician combine a bat

ch of an acid solution that is pure acid with another that is ​10% to get the desired​ concentration?
Mathematics
1 answer:
Ludmilka [50]3 years ago
5 0
Honedtlrfjdjdjdjfjfjjfjfjfjjf
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PLZ HELP, WILL MARK BRAINLIEST
andreev551 [17]

220.5

i dont know how to show my work sorry :) hope it helps

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3 years ago
(5x2−3x−2)−(−2x2−x+10)<br><br><br><br> in standard form please?
Andreyy89

Answer:

7x^2−2x−12

Step-by-step explanation:

hope this helps:)

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3 years ago
What is the slope of a line that is perpendicular to the line whose equation is 8y−5x=11?
ElenaW [278]

9514 1404 393

Answer:

  -8/5

Step-by-step explanation:

When you solve for y, the slope of the line is the x-coefficient. For the given line, that is ...

  8y = 5x +11 . . . . . add 5x

  y = 5/8x +11/8 . . . . divide by 8

The given line has a slope of 5/8. The perpendicular line will have a slope that is the opposite of the reciprocal of this:

  -1/(5/8) = -8/5 . . . . slope of perpendicular line

4 0
2 years ago
Read 2 more answers
Need help fast please with these 5 questions
Natali [406]

Answer:

16.....................................

  • 6⁹*6ⁿ = 6¹²
  • 6⁹⁺ⁿ = ¹²
  • 9 + n = 12
  • n = 3

17.....................................

  • 7⁸/7ⁿ = 7³
  • 7⁸⁻ⁿ = 7³
  • 8 - n = 3
  • n = 5

18.....................................

  • 15ⁿ = 1
  • 15ⁿ = 15⁰
  • n = 0

19.....................................

  • 1/10⁵ = 10ⁿ
  • 10⁻⁵ = 10ⁿ
  • -5 = n
  • n = -5

20.....................................

  • (8²)ⁿ = 8¹²
  • 8²ⁿ = 8¹²
  • 2n = 12
  • n = 6

3 0
2 years ago
In a class of 7, there are 3 students who have done their homework.
max2010maxim [7]

Answer:

4/35

Step-by-step explanation:

Probability of 1 student having no hw is 4/7, then 3/6, then 2/5

4/7 x 3/6 x 2/5 reduces to 4/35

5 0
3 years ago
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