When graphing pairs of similar triangles i don't know how to figure out positive and negative for the fraction of slope

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

If the slope of one line equals the slope of another line then ? a) the two lines are intersecting lines b) the two lines are perpendicular lines c) the two lines are parallel lines d) the two lines always have very steep slopes

The angles below are supplementary. what is the value of x? a pair of supplementary angles is shown. one angle measures 7x + 33, and the other angle measures 70. 5.3 8.14 11 14.7