Can someone plesse tell me how to do 15 and

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.

Which table represents a linear function? i'll give brainliest to first answer ^'^

Select all the expressions that will include a remainder.