<h2>Scalene is the correct answer</h2><h2></h2><h3>(Assuming you mean side lengths when you say 3, 8, 12.)</h3><h3></h3><h3><em>Please let me know if I am wrong.</em></h3>
Answer:1440 degrees
Step-by-step explanation:
The interior angles of a decagon is 1440 degrees. All sides are the same length (congruent) and all interior angles are the same size.
The sum of three consecutive integers is three times the middle one: if we call the middle one
, the three numbers are

So, their sum is 
Which is three times the middle one.
So, if the sum of three consecutive intergers is 48, the middle one must be 48/3 = 16.
So, the three numbers are 15, 16 and 17
Answer:
B
Step-by-step explanation:
5(2x+4)=30
10x+20=30
10x=10
x=1