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Vika [28.1K]
4 years ago
9

Why is 7.8 an irrational number?

Mathematics
2 answers:
andreyandreev [35.5K]4 years ago
6 0
Its 78/10 = 39/5
Hope it helps :)
Nesterboy [21]4 years ago
6 0

Answer: It is a rational number

Step-by-step explanation:

any number that can be written in the form of fraction is rational number (or as   the a decimal that has a end or repeating decimal are rational number)

7.8=39/5

Hope this helps!! :)

Please let me know if you have any question

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LUCKY_DIMON [66]

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I hope I helped you^_^

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Cube 1 has a volume of c3. The side lengths of Cube 2 are three units longer than those of Cube 1. What is the volume of Cube 2?
kotegsom [21]
Volume of a Cube:  
<span>Since all of the edges of a cube are of equal length, there is no need to differentiate between the length, width and height.  The volume of a cube is determined by multiplying the length of three edges of the cube.  Let "a" define the length of an edge of the cube.  

Then the volume formula is defined as:</span>
V = a<span> × </span>a<span> × </span>a
<span>This formula is also written as V = a³<span>.

If a = 5 feet, then the volume is found like this:</span></span>
V = (5)³ = 5<span> × </span>5<span> × </span>5 = 125:  Since each value is a measurement of feet, the volume is therefore 125 cubic feet. 

Example 1:<span> Find the volume of a solid cube shape box whose side is 13m.</span>
Solution: 
<span>Given that: side a = 3m
Volume of the cube is therefore:</span>
V = a³
V = 13³
<span>V = 2197 m3</span>

Example 2:<span><span> Find the measure of volume of a cube for the given side length is 20 inches?</span>
<span>Solution:</span> 
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Volume of the cube is therefore:</span></span>
V = a³
V = 20³
<span>V = 8000 in3</span>
<span>Therefore, volume of a cube is 8000 in3.

</span>
Example 3:<span> Find the volume of a cube for the given side length 12.5 meter?</span>
Solution: 
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</span>
4 0
3 years ago
10x - 4y=-20<br> Please help find number that fit to x and y that get me -20
garik1379 [7]

Answer: (0, 5) and (-2, 0)

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

10x - 4y = -20

Let x = 0, then 10(0) - 4y = -20

                                  -4y = -20

                               <u> ÷ -4 </u>   <u>÷ -4  </u>

                                     y = 5

Let y = 0, then 10x - 4(0) = -20

                         10x -  0    = -20

                      <u> ÷10           </u>    <u> ÷10   </u>

                             x         = -2

7 0
3 years ago
Write a number sentence to add 6 ones to 21.Write number sentence to add 6 tens to 21
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I do suppose that you refer to adding these quantities:
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<span>and
6/10 + 21
</span>= 3/5 + 21
= 3/5 + 105/5
<span>= 108/5</span>
8 0
4 years ago
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