Question 314180
A sample of 400 grams of radioactive sustance decays according to the function A(t) = 400e negative.032t, where t is the time in years.  How much of the substance will be left in the sample after 10 years?
.
Given
{{{ A(t) = 400e^(-.032t) }}}
Simply plug in the 10:
{{{ A(t) = 400e^(-.032*10) }}}
{{{ A(t) = 400e^(-.32) }}}
{{{ A(t) = 400(.7261) }}}
{{{ A(t) = 290.460 }}} grams