Hello there. So that triangle is called an isosceles. You can tell because of the two lines on either side, they remind you that opposite sides are equal. So in this case, x would be 75 because both sides are equal.
For part 2, we already know 2 angles. 75 and 75. If we add them together, we get 150. Angles in a triangle add up to 180 degrees. So in that case, 180 - 150 will give us 30 degrees. So the missing top angle must be 30 degrees.
