okay I can at least help with the last two.
the third one with the perpendicular lines is pretty simple of you put it into an equation. the two equation on the angles equal each other, since they are directly opposite of each other and therefore are the same angle size.
that means that 5x-12 is equal to the equation on the other side (I can only see the -10 and can not help you answer the problem completely) but in the end, if you do the problem right, they should both equal the same number. bonus: you can subtract the two numbers you get from 360, then divide by two. this should get the angle size for the other angles provided. if it does not make sense, you might want to retry the problem.
for the last one, the straight line is always 180. in order to find the answer to x, you must first subtract 180-45 to get the total angle size for the angle labeled 3x. if you do this, the equation you then need to solve should be 135=3x. divide 135÷3 and x=63.
