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Bess [88]
3 years ago
9

Which expression is equivalent to: 7a + 5 (Give an explanation)

Mathematics
1 answer:
sveticcg [70]3 years ago
7 0
D is the answer I believe
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ch4aika [34]
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A chemistry teacher needs to mix a 20% salt solution with an 80% salt solution to make 20 qt of a 40% salt solution. How many qu
Svetlanka [38]

Answer:

  • 6 2/3 qt 80%
  • 13 1/3 qt 20%

Step-by-step explanation:

It is often convenient to solve a mixture problem by letting a variable represent the quantity of the higher-concentration contributor to the mix.

__

We can let x represent the number of quarts of 80% solution needed. Then (20-x) is the number of quarts of 20% solution needed. The amount of salt in the final mix is ...

  0.80x +0.20(20-x) = 0.40(20)

  0.60x = 0.20(20) . . . . . . . . subtract 0.20(20) and simplify

  x = 20/3 = 6 2/3 . . . . . . . . . divide by 0.60; quarts of 80% solution

  (20 -x) = 13 1/3 . . . . . . . . . . amount of 20% solution needed

The teacher should mix 6 2/3 quarts of 80% solution with 13 1/3 quarts of 20% solution.

3 0
2 years ago
What are extremes in math with an example so I can understand it better?
anzhelika [568]
Y=x2 the extreme would be x=0
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3 years ago
1. What does the algebraic representation (x,y) → (x-1, y-2) represent?
Anna [14]

Answer:

A) Each point will translate 1 unit left and 2 units down

Step-by-step explanation:

I got it right in my test Answer A

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2 years ago
A solution of the inequality 2x + y < -3 in order pair
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its your ans have a nice day

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