The rate at which 100 milligrams of 238U is decaying can be modeled as r(t) = -1

The rate at which 100 milligrams of 238U is decaying can be modeled as

r(t) = -1.55(0.9999999845+)10-6 milligrams per year

where t is the number of years since the 100 milligrams began decaying. +

(a) How much of the 238U will decay during the first 300 years? (Round your answers to four decimal places.) milligrams

How much of the 238U will decay during the first 1300 years? (Round your answer to four decimal places.) milligrams

(b) How much of the 238U will eventually decay? (Round your answer to the nearest integer.) milligrams