Question 936616

The rate of change represents the gas mileage in miles per gallon. Between which two measurements was the gas's mileage least?


Miles Driven .....|{{{0}}} |{{{60}}}| {{{150}}}| {{{170}}}|{{{ 230}}}|{{{ 260}}}| 
Gas Used(gal) ...|{{{0 }}}..|{{{2}}}|....{{{ 5}}}|....{{{ 6}}}|.... {{{9}}}| ....{{{11}}}|
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rate of change: 
{{{(150-60)/(5-2)=90/3=30}}}
{{{(170-150)/(6-5)=20/1=20}}}
{{{(230-170)/(9-6)=60/3=20}}}
{{{(260-230)/(11-9)=30/2=15}}}

so, we have

Miles Driven .....|{{{0}}} |{{{60}}}| {{{150}}}| {{{170}}}|{{{ 230}}}|{{{ 260}}}| 
Gas Used(gal) ...|{{{0 }}}..|{{{2}}}|....{{{ 5}}}|....{{{ 6}}}|.... {{{9}}}| ....{{{11}}}|
-------------------------------------------------------
------------------------{{{30}}}|  {{{30}}}|....{{{20}}}|....{{{20}}}|....{{{15}}}|

Between {{{9}}} and {{{11}}} the gas's mileage was least.