Question 1102662
Your model is using 60 units or pounds for a starting quantity, and ASSUMING you forgot to include the NEGATIVE SIGN in your exponent expression, the model should be  {{{y=60*2^(-0.2t)}}}.  No usually any reason for using all upper case letters including the variables, unless you have some specific purpose for distinguishing between upper and lower cases.


Let t=30, and solve for y.


{{{y=60*2^(-0.2*30)}}}

{{{y=60*2^(-6)}}}

{{{60(1/64)}}}

{{{highlight(y=0.9375)}}}  or {{{y=15/16}}}, or fifteen ounces