Answer:x = -20.6
Step-by-step explanation:
Answer:
The answer is -20.6
-5x-25=78
-5x+25-25=78+25
-5x=103
-5x/-5=103/-5
x=-20.6
x = 4
all angles in triangle add to 180
90+70=160
180-160=20
20÷5=4
A Parallelogram
54
all you have to do is times 18 by 3