heres another one pls help i need only one assignment for my grade to get to a B

Heres Another One Pls Help I Need Only One Assignment For My Grade To Get To A B class=

Answer :

Answer:

90

Step-by-step explanation:

angle f = 70 degrees and all the lines are equal (70 degrees)

90°-20°=70°

90 is the answer I took the test