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creativ13 [48]
3 years ago
7

A. 12 + 4x = 6x + 10 – 2x

Mathematics
1 answer:
GalinKa [24]3 years ago
3 0

An equation has infinitely many solutions if it can be manipulated all the way to an identity (i.e. an equality where the right and left hand side are the same). We have:

A) 12+4x=6x+10-2x \iff 12+4x=10+4x \iff 12=10

which is impossible

B) 5x+14-4x=23+x-9 \iff x+14 = x+14

which is an equality

C) x+9-0.8x=5.2x+17-8\iff 0.2x+9=5.2x+9 \iff 0.2x=5.2x\iff x=0

which has a unique solution

D) 4x-2x=20 \iff 2x=20 \iff x=10

which has a unique solution

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The answer is:  "12 feet" .
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Note:  In a square, the length of EACH of the four sides of the square is the same.

Area = Length * width. 

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  →  s² = 144 ft² ;  Take the "square root" of each side ;

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