I think it would be 72+4x=400
400-72= 328
328/4= 82
So the answer would be 82=x
X=0.697
x=4.30
Hope this helps
42in.^2 should be the answer that you are looking for. Hope this helps
You want to find the time <em>t</em> such that

Divide both sides by $200 :

Take the logarithm of both sides:

Divide both sides by 0.04 and solve for <em>t</em> :

Its in the hundreds column