Over what interval is the function in this graph decreasing

How many sides does a regular polygon have if each exterior angle measures 72a.3b.4c.5d.6

(05.08a)triangle abc is transformed to similar triangle a′b′c′ below: a coordinate plane is shown. triangle abc has vertices a at 2 comma 6, b at 2 comma 4, and c at 4 comma 4. triangle a prime b prime c prime has vertices a prime at 1 comma 3, b prime at 1 comma 2, and c prime at 2 comma 2. what is the scale factor of dilation? 1 over 2 1 over 3 1 over 4 1 over 5

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?