This is for my maths homework but i really don't know how to do the second one. could someone .

The angle below 81° must be 180-81=99°

The sum of that angle, the 154°, and x must equal 360° so:

x=360-154-99

x=107°

...

That downward pointing triangle on the left side has equal sides with an apex angle of 24°.  So its base angles must be (180-24)/2=78°.  Then the angle opposite it in the base of the upward pointing triangle in the center is also 78°.  

Now that means that base angles of the second downward pointing triangle on the right side must be equal to (180-78-44)=58°.  And this downward triangle has equal length sides, so y° must be supplementary to 58°.

So y=180-58

y=122°

A: 18/15b : 7 - -8 = 15 , 12 - -6 = 18 the y variable always goes over the x variables, c : same thing a