Question 1022772
Okay, from
y=ae^-0.0974t
we plug in for t and y and solve for a...
(Of course we could solve for a first and then plug in...)
{{{20 = a*e^(-0.0974*15)}}}
Now evaluate the exponential expression and get
{{{20 = a*(.232)}}}
so that, when we divide by .232, we get
a = 86.2 grams