PLEASE HELP ME ASAP I AM REALLY BAD AT KHAN ACADEMY

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

(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

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?