What do these circles have in common?

Idont get this question can someone me solve it? ** the distance light travels in one second (1 light second) is about 1.86 ×10^5 mi. saturn is about 475 light-seconds from the sun. about how many miles from the sun is saturn..my guess is 8.83* 10^7 you so much

What is the inverse of the function f(x) = 2x + 1?

The table represents a function f(x). what is f(3)? a.-9 b.-1 c.1 d.9