If triangle ABC is congruent to triangle DEC, then all the lengths and angles in the one triangle are equal to their corresponding lengths and angles in the other triangle.
In other words, Angle B = Angle E
x+15 = 6x-65
Now solve for x:
-80 = 5x
-16 = x
Answer:
The answer is B. Acute isosceles
You should add the two bases and muliply them with the height and then divide with 2
(14+18)×10÷2=160
1) Cancel out the common factor which in this case is 8 
2)First apply exponent rule 
now cancel out the common factors which are n and n+7 leaving you with 
3)Factorize 
cancel out the common factor in this case x+2 leaving you with 
4) Factorize 
cancel out the common factor in this case 3w-1 leaving you with 
5) In the picture
6)In the picture
I am REALLY tired sorry I wont be able to do the rest, I hope these are helpful :)
The correct should be X=10
