i do the integral from 0 to 200 of the function for a but it is wrong

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.T (a) How much of the 238U will decay during the first 200 years? (Round your answers to four decimal places.)-U.0003 x milligrams — How much of the 233U will decay during the first 1200 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 Need Help? i i Submimnswer