Well, first off, let's find what is the slope of BC

now, a line perpendicular to that one, will have a negative reciprocal slope, thus

now, we know the slope "m" of AB is -2 then, thus
Answer:
Step-by-step explanation:
270 degrees
Answer:
Follow the steps
Step-by-step explanation:
Angle M is 95 degrees.
I got 7.1 x 10^(-11) but it's been a few years so I could've done it wrong