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tatiyna
2 years ago
6

An automotive website would like to estimate the percentage of drivers who own their cars, rather than lease their cars. Which o

f these survey methods would not provide a convenience sample to estimate the percentage who own their cars?
a survey of adults at an auto parts store
a survey of all adults attending a car show
a survey of people in a car dealership
an online survey for sharing data about their cars
Mathematics
1 answer:
Ksivusya [100]2 years ago
4 0
The answer to your question is the last option. “An online survey for sharing data about their cars”. Have a great day
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Free_Kalibri [48]

Solution for \frac{2}{7}m - \frac{1}{7} = \frac{3}{14} \ is \ m = \frac{5}{4} \ or \ m = 1\frac{1}{4} \ or \ m = 1.25

<h3>Further explanation</h3>

A case about one variable linear quations. We have to solve the equation to get the variable m. Let's isolate the variable m alone at the end of the process on one side of the equation, until the variable will be equal to a value on the opposite side.

We add \frac{1}{7} to both sides:

\frac{2}{7}m - \frac{1}{7} + \frac{1}{7} = \frac{3}{14} + \frac{1}{7}

\frac{2}{7}m = \frac{3}{14} + \frac{1}{7}

On the right side for the addition operation, we equate the common denominator by multiplying \ \frac{1}{7} \ by \ \frac{2}{2}

\frac{2}{7}m = \frac{3}{14} + \frac{2}{14}

Then we combine terms to get:

\frac{2}{7}m = \frac{5}{14}

We divide by the coefficient of m, or in other words, multiply both sides by \frac{7}{2}:

\frac{2}{7}m \times \frac{7}{2} = \frac{5}{14} \times \frac{7}{2}

Finally, the solution is obtained as follows

m = \frac{35}{28}

We simplify fractions, both the numerator and denominator are divided equally by 7.

\boxed{ \ m = \frac{5}{4} \ }

In the form of mixed fractions, we get:

\boxed{ \ m = 1 \frac{1}{4} \ }

In decimal form, we get

m = 1 \frac{25}{100} \rightarrow \boxed{ \ m = 1.25 \ }

Check the solution into the equation:

\big( \frac{2}{7} \times \frac{5}{4} \big) - \frac{1}{7} = \frac{3}{14}

\frac{10}{28} - \frac{1}{7} = \frac{3}{14}

\frac{5}{14} - \frac{2}{14} = \frac{3}{14}

\frac{3}{14} = \frac{3}{14}

Both sides show the same value, so the solution is correct.

Quick steps in summary:

\frac{2}{7}m - \frac{1}{7} = \frac{3}{14}

\frac{2}{7}m = \frac{3}{14} + \frac{1}{7}

\frac{2}{7}m = \frac{3}{14} + \frac{2}{14}

\frac{2}{7}m = \frac{5}{14}

m = \frac{5}{14} \times \frac{7}{2}

m = \frac{35}{28}

\rightarrow \boxed{ \ m = \frac{5}{4} \ }

\rightarrow \boxed{ \ m = 1 \frac{1}{4} \ }

\rightarrow \boxed{ \ m = 1.25 \ }

Note:

The important thing to do is how to manipulate both sides of the equation with the algebraic properties of equality such as:

  • adding,
  • subtracting,
  • multiplying, and/or
  • dividing both sides of the equation with the same number.

All these processes can occur repeatedly until the isolated variables are obtained on one side of the equation. In the form of fractions, the steps that must be considered are

  • equate the denominator,
  • simplify fractions, and
  • turn fractions into mixed fractions or decimal forms.

Let's practice a lot until you get used to and know which operations should be done first.

<h3>Learn more</h3>
  1. A word problem that forms a single variable linear equation brainly.com/question/1566971
  2. Learn more about single variable linear equation that has no solution, has one solution, and has infinitely many solutions brainly.com/question/2595790  
  3. Questioning the stages of solving a word problem about one variable linear equations brainly.com/question/2038876
<h3>Answer details  </h3>

Grade       : Middle School

Subject     : Mathematics

Chapter    : Linear Equation in One Variable

Keywords : solve, solution, variable, coefficient, 2/7m - 1/7 = 3/14,  5/4, 1 1/4, 1.125, algebraic properties of equality, one, linear equation, isolated, manipulate, operations, add, substract, multiply, divide, fraction, equate, denominator, numerator, both sides, decimal, brainly

6 0
3 years ago
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