During the 2012 London Olympics, athletes from the United States won more medals in swimming than any other country. The number of medals earned in swimming by United States athletes are shown in the table below.

22.5

Step-by-step explanation:

math

It is given that the third terms is obtained by multiplying the second term by 2 and then adding 3:

Since the third term is 17, we have

And then again, the second term is obtained by multiplying the first one by 2 and then adding three:

Solve this equation for and you'll get the answer