the trick to finding an angle in a triangle when given the other 2 angle values is to know that all three angles add up to 180. so:
angle1 + angle2 + angle3 = 180
so for problem #1
x + 45 + 44 = 180
this can be written:
x = 180 - 45 - 44
x = 91
so answer is 91
you can use this to easily find other angles on your own.
to classify:
scalene = no angles are equal
right = 1 angle is 90
isosceles = 2 angles equal
equilateral = all angles equal
using this you can now classify on your own