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sladkih [1.3K]
3 years ago
15

-3/4 - 1/5 divide by 2/5 = ? can you explain how to work this problem also

Mathematics
1 answer:
sweet-ann [11.9K]3 years ago
7 0

<u>Answer:</u>

-2\frac{3}{8}

<u>Step-by-step explanation:</u>

We are given the following expression and we are to solve it:

\frac{-\frac{3}{4} -\frac{1}{5} }{\frac{2}{5} }

Firstly, we will take the LCM of the fractions in the denominator to make it a single fraction and then solve further:

\frac{\frac{-3(5)-1(4)}{20} }{\frac{2}{5} }

\frac{\frac{-15-4}{20} }{\frac{2}{5}}

\frac{-\frac{19}{20} }{\frac{2}{5} }

Changing the division into multiplication by taking a reciprocal of the denominator:

-\frac{19}{20} *\frac{5}{2}

-\frac{19}{8}

-2\frac{3}{8}

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Using the rule of exponents

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working alone, aliyah can dig a 10ft by 10 ft hole is 6 hours. one day her friend eugene helped her and it only took 3.75 hours.
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I think the answer is 10 hours

the 11.95 seems wrong

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3 years ago
On a recent trip to the convenience​ store, you picked up 3 gallons of​ milk, 4 bottles of​ water, and 8 ​snack-size bags of chi
Andrew [12]
To find the answer you will write and equation in terms of the cost of a bag of chips.  

3(cost of milk) + 4 (cost of water) + 8 (cost of bag of chips) = $21.30
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    22c + 4.80 = 21.30
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  22               22
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The chips cost $0.75 each.

The milk costs (2 x $0.75 + $1.60) $3.10 each.

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4 years ago
The measure of each interior angle of a regular polygon is 120°. Find the number of sides.
Archy [21]

Answer:

6

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You can memorize these for the smaller shapes

for equilateral polygons:

triangle: 60

square: 90

pentagon: 108

hexagon: 120

Otherwise, I believe the formula is the total degrees in a polygon (s-2)*180 where s is the number of sides.

So the measure of each angle on average would be (s-2)*180/s.

There (s-2)*180/s = 120

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180s-360 = 120s

60s = 360

s = 6

6 0
3 years ago
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