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KonstantinChe [14]
2 years ago
11

When 21 is subtracted from the square of a number, the result is 4 times the number.

Mathematics
1 answer:
bixtya [17]2 years ago
8 0

Answer:

7

Step-by-step explanation:

7^2 =49

49 -21 =28

28÷7 = 4

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To prove a similarity of a triangle, we use angles or sides.

In this case we use angles to prove

∠ACB = ∠AED (Corresponding ∠s)
∠AED = ∠FDE (Alternate ∠s)

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∠BAC = ∠EFD (sum of ∠s in a triangle)

Now we know the similarity in the triangles.

But it is necessary to write the similar triangle according to how the question ask.

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Similarly, if the question asks " ∆ACB is similar to ∆____. "
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7 0
3 years ago
Plz help and thanks so much for it
kirza4 [7]
B+c+(c-b)+(b-c). That is your expression.  b 11 c 16
       
          First, let's convert the variables to real numbers:   11+16+(16-11)+(11-16)
             Now, let's solve that equation.                                    11+16+5+(-5)
                      5+(-5) cancels out, so all we have left is:                   27
                That is your perimeter.
    
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The answer is B

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