Question 1129782
Let {{{ r }}} = rate of decay in 250 min
When {{{ t=250 }}} this is true:
{{{ 32 = 250*( 1 - r )^(t/250) }}}
{{{ 32 = 250*( 1 - r )^(250/250) }}}
{{{ 32 = 250*( 1 - r ) }}}
{{{ 1 - r = .128 }}}
{{{ r = .872 }}}, so I can say:
{{{ f(t) = 250*( 1 - .872 )^( t/250 ) }}}
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check:
{{{ f( 250 ) = 250*.128^(250/250) }}}
{{{ f(250) = 250*.128^1 }}}
{{{ f(250) = 32 }}}
OK
Feel free to get another opinion, too