Question 1124886
(a)
{{{ V = 11000*( 1 - .2 )^t }}}
(b)
{{{ 6000 = 11000*.8^t }}}
{{{ .54545 = .8^t }}}
Take the log base 10 of both sides
{{{ -.2632 = t*(-.0969 ) }}}
{{{ t = 2.7162 }}} yrs
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(c)
{{{ 3400 = 11000*.8^t }}}
{{{ .3091 = .8^t }}}
Take log of both sides
{{{ -.5099 = t*(-.0969 ) }}}
{{{ t = 5.2623 }}} yrs
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Get 2nd opinion if needed