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SSSSS [86.1K]
3 years ago
10

What is the value of x in the equation x – y = 30, when y = 15? its not 45 tho

Mathematics
2 answers:
Charra [1.4K]3 years ago
7 0
-15 would be your answer a negative plus a negative the signs together would turn negative 15 to positive
Anton [14]3 years ago
5 0
It’s -15 because when you subtract 15 from 30 it turns out as 15 but then when you try doing +15-15 it comes out as 0, instead of adding positive 15, do negative because a negative times a negative is positive.
The answer would be -15-15=30

Hope this helps!!
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jonny [76]

We will see that the cost of filling the tank is $38.88, and at the final of the trip she will have 4 gallons on the tank.

<h3>How much costs to fill the tank?</h3>

a) The car holds 18 gallons, and it has 1/5 of the tank remaining.

Then in the tank there are:

(1/5)*18 = 3.6 gallons.

Then we need 18 gal - 3.6 gal = 14.4 gal

And each gallon costs $2.70, then to fill the tank, Miss Kito needs:

(14.4)*$2.70 = $38.88

b) Now we know that the car travels 26 miles per gallon, and she needs to travel a total distance of 364 miles.

Then she needs:

\frac{364mi}{26 mi/gal} = 14 gal

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2 years ago
How do I use Negative and Zero Exponents
andrew-mc [135]
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8 0
3 years ago
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kiruha [24]

For this case we have the following expression:

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We multiply both sides by: (\frac {1} {36}) ^ {3n}

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We divide both sides by 216:

\frac {216 ^ {n-2}} {216} = (\frac {1} {36}) ^ {3n}

To divide powers of the same base, we place the same base and subtract the exponents:

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Rewriting:

(6 ^ 3) ^ {n-3} = (\frac {1} {6 ^ 2}) ^ {3n}\\6 ^ {3n-9} = \frac {1} {6 ^ {6n}}\\6^{ 3n-9} * 6^{ 6n} = 1

To multiply powers of the same base, we place the same base and add the exponents:

6^{ 3n-9 + 6n} = 1\\6^{ 9n-9} = 1

We know that any number raised to zero is 1, a ^ 0 = 1.

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9n-9 = 0\\9n = 9\\n = \frac {9} {9}\\n = 1

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3 years ago
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