Answer:
B) x = 3
Step-by-step explanation:
The given triangle has three angles:
∠R, ∠S and ∠T
The exterior angle theorem says that
∠S+∠T = ∠R
Putting the values of angles
(57+x) + 25x = 45x
57 + x + 25x = 45x
57+26x = 45x
57 = 45x - 26x
57 = 19x
x = 57/19
x = 3
Hence, the correct answer is:
B) x = 3 ..
