Suppose the quantity (in grams) of a radioactive substance present at time t is Upper Q left parenthesis t right parenthesis equals 9604 left parenthesis 7 Superscript negative 0.5 t Baseline right parenthesis Q(t)=96047−0.5t,

where t is measured in months.

a. How much will be present in 44 months?

b. How long will it take to reduce the substance to 44 grams?

c. There will be nothing grams of the substance present in 44 months.