Answer:
z=15
<A=168
<B=12
Step-by-step explanation:
supplementary means two angles that equal 180
so we can set up an equation like this, (10z+18)+(5z-63)=180
calculate to find z
z=15
then to find the angles put 15 into the equations where z is.
10(15)+18=168
5(15)-63=12
