I need help with this

Asequence of numbers begins with 12 and progresses geometrically. each number is the previous number divided by 2. which value can be used as the common ratio in an explicit formula that represents the sequence? 1/2 2 6 12

Write an equation for the function that includes the points (1,4/5) and (2,2/3)

What are the coordinates of the image of p for a dilation with center (0, 0) and scale factor 2