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-BARSIC- [3]
3 years ago
11

Selma hypothesizes that the mass of a sample of water will not change if it is frozen. She conducts an experiment to test her hy

pothesis. Her experimental steps are as follows:
1. Fill a beaker with 500 mL of water.
2.
3. Place the beaker in the freezer.
4. After the water freezes, place the beaker on the balance and measure its mass.

Which of the following steps is missing from Selma's experiment?

Place the beaker on the balance and measure its mass.
Run the water through a filter to make sure there are no impurities in it.
Set a timer for 2 hours.
Use a thermometer to measure the water's temperature.
Mathematics
2 answers:
egoroff_w [7]3 years ago
4 0
Place a beaker on a balance and measure the mass
Sphinxa [80]3 years ago
4 0

Answer:

place the beaker on the balance and measure its mass.

Step-by-step explanation:

In order to see if the mass of the water changed, Selma first needs to find out what the mass of the liquid water is in order to compare it to the mass of the frozen water.

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An error has been made in subtracting the two polynomials shown in the work below the problem is (6x^2-4x-5)-(3x^2-7x=2)
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Answer/Step-by-step explanation:

Let's work out the subtraction of the polynomial to find out where the error is and the correct result we should have.

6x² - 4x - 5

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= [6x² - 3x²] [-4x -(-7x)] [-5 -(+2)]

= 3x² + 3x - 7

The error that was made in the subtraction given in the question was that the negative signs before the terms, 7x and 5 were ignored while subtracting.

The sign is very important, it defines the value of the term.

We can choose to solve the problem in another way shown below:

(6x² - 4x - 5) - (3x² - 7x + 2)

Distributive the negative sign in the second polynomial

6x² - 4x - 5 - 3x² + 7x - 2

Combine like terms

6x² - 3x² - 4x + 7x - 5 - 2

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3 years ago
What is x – 8.1 = 5.3
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