Answer:
a.) x=12
b.) ∠A=50°
Explanation:
See explanation on the other question. :D
Basically:
a.) All triangles' angles add up to 180°. Take all given values to set up an equation in which the sum is 180. Simplify and solve for x.
Result: x=12
b.) Insert the value of x into the given values of ∠A. Simplify.
Result: ∠A= 50°