Answer:
Step-by-step explanation:
First of all, D is the supplement to the right angle. Together they equal 180 degrees providing the right angle is sitting on a line.
d + 90 = 180 Subtract 90 from both sides.
d = 180 - 90
d = 90
e is vertically opposite the 49 degree angle. Therefore e = 49 (that's what vertically opposite angles do).
f is supplementary to e. Together they add to 180
e + f = 180 But you know e is 49 so
49 + f = 180 Subtract 49 from both sides.
f = 180 - 49
f = 131
