Answer:
Explanation:
so the probably seems impossible b/c there is some "implied" knowledge. You are supposed to remember that interior angles of a triangle add up to 180 °. Which I bet you knew.. .huh
so let's put that knowledge to work to help us solve this
we can say that all of the angles add up to 180 like this:
180 = (x-4) + (11x-11) + (x+13)
see? now group all the like terms, that is, put the x'es together & the numbers
180 = 13x -2
see? I just grouped the x terms and the constant terms, now move the 2 arcoss the equal sign to the other side, by adding 2 to both sides
182 = 13x
see? now divide both sides by 3 :)
14 = x
now we know what x is so plug that into the expression for the C angle
∠C = x-4
∠C = 14-4
∠C = 10 °
there you go. :)
best of luck, just leave a message in the comments if you have more questions , I'll see it there :)