Its 43. All triangles add to 180 so 47 + 90 = 137. then subtract 180 - 137 and get 43
Did you figure out the answer cause i need it
So,

Multiply both sides by 11.

Divide both sides by 7.
f = 1
Check.


This checks.
S = {1}
Answer:
18
Step-by-step explanation: