Can anyone help pls :)? Thank you

If you double the input of a function and it results in half the output, and if you triple the input and it results in a third of the output, what can be guessed about the function? check all that apply.

What is the perimeter of a rectangle if the length is 5 and the width is x?

In austin texas 8 bats ate 40 grams of insects in one night at this rate how many grams of insects could 64 bats eat in one night