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aliya0001 [1]
4 years ago
12

A student is attempting to solve the equation below for the variable x. Which of the statements below best applies to the mathem

atical work shown? Given \sqrt(2x+22)=5 I square both sides, which gives me the equation 2x + 22 = 25. I can then solve for x, yielding x = –9.5 as my final answer. A. The student did not correctly square both sides of the equation. B. The student did not properly isolate the variable after squaring both sides of the equation. C. The student omitted a negative solution to the equation. D. The mathematical work is correct.
Mathematics
1 answer:
Elanso [62]4 years ago
7 0
Please answer please please thank you
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The answer is $350.00

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The answer would be $350.00 because if you are charging an account forfive hours of whatever, and it costs $70.00 and hour, then you would multiply the two numbers. 5*$70 which equals $350.

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We know that, in the US, the average mile per gallon was 25 mpg in 2015. Since we don't have the mile per gallon of the car in our problem, we are going to use that average.
For our first situation, <span>drive 0.3 miles to fill up for $3.59 per gallon:
</span>\frac{25miles-----\ \textgreater \ 1gallon}{0.3miles-----\ \textgreater \ xgallons}
\frac{25}{0.3} = \frac{1}{x}
x= \frac{(1)(0.3)}{25}
x=0.012
<span>We just proved that in our trip, we used 0.012 gallon, and at $3.59 per gallon; we will pay  (0.012)(3.59)=$0.04 for that gasoline.

For our second situation, </span><span>drive 1.2 miles to fill up for $3.41 per gallon:
</span>\frac{25miles-----\ \textgreater \ 1gallon}{1.2miles-----\ \textgreater \ xgallons}
\frac{25}{1.2} = \frac{1}{x}
x= \frac{(1)(1.2)}{25}
x=0.048
We just proved that in our trip, we used 0.048 gallon, and at $3.41 per gallon; we will pay  (0.048)(3.41)=$0.16 for that gasoline.

We can conclude that is much better to drive 0.3 miles to fill up for $3.59 per gallon than drive <span>1.2 miles to fill up for $3.41 per gallon.</span>
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