Please help me with this question

Given the replacement ser {0,1,2,3,4} solve 7x -3 = 25

Which is a true statement about an exterior angle of a triangle a. it is formed by two segments that are not sides of the triangle, b. it forms a linear pair with one of the interior angles of the triangle, c. it is complementary to one of the interior angles of the triangle. d. it is formed by two segments that are sides of the triangle.

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.