How do I solve the length of AC?

What ratio is proportional to 18/21

Six random samples were taken each year for three years. the table shows the inferred population for each type of fish for each year.

Circle a has center of (2,3) and a radius of 5 and circle b has a center of (1,4) and a radius of 10. what steps will show that circle a is similar to circle b 1) dilate circle a by a scale factor of 2 2) translate circle a using the rule (x+1,y-1) 3) rotate circle a 180 degrees about the center 4) reflect circle a over the y-axis