[20 ! someone me serious answers only

Hi there! 

I am not the greatest at functions, but I hope this helps you!

Part 1:
The input is multiplied by 2 and increased by 1 to get the output.

Or, the output is all odd numbers (consecutively) and the input is all numbers both even and odd (consecutively).

Part 2:
F(n) = 2x + 1

The blank next to the input 3 would be 7 because (3 x 2) + 1. The blank next to the output 13 would be 6.

I’m guessing that the answer is c, but i’m not sure which grid is being talked about. since 5x5= 25 and 3x3= 9 (which there are no answers for). a is not right because while the ratio is the same, 6/25= 0.24 which is equal to 24% not 30%.

Ais the correct answer