Answer:
B seems right
Step-by-step explanation:
100+75+70+x= 360° (sum of interior angles of quadrilateral)
x= 360-245= 115°
-2
8(17-12)/ -2(8+2).
A negative and a negative equals a plus
8(5) / -2(10)
40 / -20
= -2
Answer:
Step-by-step explanation:

From the initial condition,

So we have that 
No such thing ,But what you can do is is go on Cymath and it will help you solve it