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Veseljchak [2.6K]
4 years ago
12

Write the number 0.21212121.. as a fraction let x=

Mathematics
1 answer:
tino4ka555 [31]4 years ago
7 0
There are 2 repeating decimals, so you will need a 1 followed by 2 zeros which is 100. You'll use 100 soon to multiply an equation.

Let's call the decimal number x.

Write   

        x =     0.212121...

Then multiply the equation above by 100, and write it above that equation.
You end up with

    100x = 21.212121...
          x =   0.212121...

Now set it up as a subtraction, and subtract the second equation from the first equation:

    100x = 21.212121...
          x =   0.212121...
- ----------------------------
      99x = 21

Now solve for x. Divide both sides by 3:

33x = 7

Divide both sides by 33:

x = 7/33

Since x = 0.212121..., an d x = 7/33, that means 0.212121... must equal 7/33.

Answer: the fraction is 7/33
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a company uses two vans to transport workers from a free parking lot to the workplace between 7:00 and 9:00 a.m. One van has 5 m
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2x + y = 71
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y = x + 5
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3 years ago
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X+2(x+3(x+4(x+5)))=153
Allushta [10]

Answer:

x=1

Step-by-step explanation:

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3 0
3 years ago
The figure is a parallelogram. One diagonal measures 28 units. Is the figure a rectangle? Explain.
Pachacha [2.7K]

Answer:

(B)

Step-by-step explanation:

From the given figure, we can see that the opposite sides of the given quadrilateral are congruent but they do not meet at right angles because there is no right angle marked on the given figure, thus the given quadrilateral cannot be rectangle (by the definition).

Therefore,  No, it is not a rectangle because the sides of the parallelogram do not meet at right angles.

Also, only one diagonal of measure 28 is given, no other diagonal is given, thus rest of the options do not hold.

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Which equation can be used to determine what number, n, is 40% of 64?
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Of means multiply, so it would be 40% x 64
40% is equivalent to 0.40, so you would use the equation 
C. 0.40(64) = n
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4 years ago
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