Question 1042644
(1)
The minimum area would be:
{{{ A[min] = 8.3*4.7 }}}
{{{ A[min] = 39.01}}}
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The maximum area would be:
{{{ A[max] = 8.3*7.1 }}}
{{{ A[max] = 58.93 }}}
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{{{ 39.01 <= A <= 58.93 }}}
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(2)
{{{ 325 <= 85 + 40t }}}
{{{ 240 <= 40t }}}
{{{  6 <= t }}}
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{{{ 85 + 40t <= 425 }}}
{{{ 40t <= 340 }}}
{{{ t <= 8.5 }}}
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{{{ 6 <= t <= 8.5 }}}