Can somebody pls help if I fail I need to go to summer school

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.

How do i do this activity, is appreciated

Which of the following is true for the relation f(x)=2x^2+1