Question 1124884
{{{ H(t) = 7*( 1 + .15 )^t }}}
 b)
{{{ 28 = 7*1.15^t }}}
{{{ 1.15^t = 4 }}}
Take the log of both sides
{{{ t*.0607 = .6021 }}}
{{{ t = 9.9186 }}} days
c)
{{{ 143 = 7*1.15^t }}}
{{{ 20.4286 = 1.15^t }}}
{{{ 1.3102 = t*.0607 }}}
{{{ t = 21.5848 }}} days
Get a 2nd opinion if needed