An exterior angle at the base of an isosceles triangle measures 140 degrees. what is the measure of the vertex angle?

What is the value of x? enter your answer in the box. photo attached.

Brian, chris, and damien took a math test that had 20 questions. the number of questions brian got right is 14 more than the number of questions chris got right. damien correctly answered 2 less than the number of questions chris answered correctly. if brian and damien have the same score, which statement is true?

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)