(4-6i)(6-8i)
24-32i-36i+48i²
24 + -68i - 48
-24-68i
Answer:
Part 1) 
Part 2) 
Step-by-step explanation:
Part 1) what is the measure of angle AFE
we know that
The measure of the interior angle is the semisum of the arches that comprise it and its opposite.
<u>Note:</u> In this problem the correct measure of arc EA is 40 degrees (see the picture)
so

substitute the given values

Part 2) what is the measure of angle EFB?
we know that
---> by supplementary angles (form a linear pair)
so
substitute the given value


The equation is

. This is because the slope form is y = mx + b, and if -5 is the slope, -5 = m. 2 is the y-intercept, and the y-intercept is b.
Answer:
80 degrees.
Step-by-step explanation:
THe reason why the 3 angles add up to 180 degrees is because they are the 3 angles in the triangle.
So m APB = 180 - 100
= 80 degrees.