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Rufina [12.5K]
3 years ago
9

I need help this is for tonight!!!

Mathematics
2 answers:
ira [324]3 years ago
7 0

Answer:

54

Step-by-step explanation:

first find x:

21x-9=14x+12

21x=14x+21

7x=21

x=3

now substitute

21(3)-9

63-9=54

Ronch [10]3 years ago
3 0
54 should be correct due to the problem given
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Answer:

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Step-by-step explanation:

In order to determine if it can create a triangle, we simple need to make sure that the value of one side is not greater than the other two added together. In this case, 10+30 > 31, which means it can be a triangle.

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4 years ago
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3 years ago
Hey can you please help me posted picture of question
Olenka [21]
Hello!

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