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padilas [110]
3 years ago
11

A student has a 2% salt water solution and a 7% salt water solution. To best imitate salt water at a local beach, he needs 1 lit

er of a 3.5% salt water solution. He defines x as the amount of 2% solution and writes this equation:
0.2x + 0.7(x – 1) = 0.35(1)
He solves the equation and determines that x is about 1.17 liters. He interprets this as needing 1.17 liters of 2% solution to make 1 liter of 3.5% solution.

What errors did the student make? Check all that apply.

The percent values were written incorrectly in the equation.
The amount of 7% solution should be written as 1 – x, not x – 1.
The equation as written is solved incorrectly. x ≠ 1.17.
x must represent the amount of the more highly concentrated solution.
The interpretation is incorrect. 1 liter of 2% solution is needed to make 1.17 liters of 3.5% solution.
Mathematics
1 answer:
Aleks04 [339]3 years ago
4 0

Answer:

The percent values were written incorrectly in the equation.

The amount of 7% solution should be written as 1 – x, not x – 1.

Step-by-step explanation:

a and b

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Find the slope of the line going through the points (-3,0) and (-3,11)
Sladkaya [172]

Answer:

m = undefined

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right<u> </u>

<u>Algebra I</u>

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Step-by-step explanation:

<u>Step 1: Define</u>

<em>Identify</em>

Point (-3, 0)

Point (-3, 11)

<u>Step 2: Find slope </u><em><u>m</u></em>

Simply plug in the 2 coordinates into the slope formula to find slope <em>m</em>

  1. Substitute in points [Slope Formula]:                                                              \displaystyle m = \frac{11-0}{-3--3}
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∴ We have a vertical line at x = -3.

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Answer:

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20. -1

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2 years ago
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