Please help, its Geometry

Agiven line has the equation 2x + 12y = −1. what is the equation, in slope-intercept form, of the line that is perpendicular to the given line and passes through the point (0, 9)? y = ( )x + 9

In need of in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.