Can someone help? I'm super confused :(

40 degrees

Step-by-step explanation:

Hi, so basically angles AOB and BOC added together equal angle measure AOC. First, we have to substitute the values in.

108=(3z+4)+(8z-28)

Then, combine like terms

108=11z-24

Add 24 to both sides

132=11z

Divide both sides by 11

12=z

So now all we need to do to find measure AOB is substitute 12 for z in the given equation (AOB=3z+4)

AOB=3(12)+4

AOB=36+4

AOB=40

Hope this helps, let me know if you're still confused!

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.