We are asked to solve the formula
![D=\frac{1}{2}fk](/tpl/images/0168/3741/e3a47.png)
for
![f](/tpl/images/0168/3741/d8b8c.png)
. Starting off, we can divide both sides by
![k](/tpl/images/0168/3741/cc0ac.png)
, so we are left with only the variable
![f](/tpl/images/0168/3741/d8b8c.png)
on the right-hand side. Next, we need to multiply the reciprocoal of
![\frac{1}{2}](/tpl/images/0168/3741/9cdae.png)
, which is
![2](/tpl/images/0168/3741/05229.png)
to both sides. This gives us
![2*\frac{D}{k}=f](/tpl/images/0168/3741/42971.png)
, which, when simplified, gives us
![\boxed{f=\frac{2D}{k}}](/tpl/images/0168/3741/8b960.png)
. Hope this helped and have a phenomenal day!