If someone knows how to do this please help !

(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

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

What is the similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3