Anybody can help me please

Me! #1 write an equation for the interior angles of this triangle that uses the triangle sum theorem. #2 what is the value of x? #3 what is the measure of #4 classify the triangle above as acute, obtuse, or right. state your reason in a complete sentence.

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Which statement best describes how to determine whether f(x) = x squared- x +8 is an even function ?