F is inversely proportional to d^2. When F = 5, d = 9
Work out d (positive value rounded to 2 DP) when F = 3

11.62

Step-by-step explanation:

F is inversely proportional to d^2, so

for some constant k.  To find  k  plug in given values for  F  and  d.

Now you can find d for F = 3.

cells do need food. in a process known as cellular respiration, cells convert biochemical energy (oxygen as food) from nutrients into adenosine triphosphate (atp), and then release waste products.

hope this .. : d