Question 1081205
<pre>
number of nickels(n) total mass (g)   slope
 4                   60g
 6                   65g              5/2
10                   75g              10/4=5/2
</pre>


Point-Slope equation form, {{{g-75=(5/2)(n-10)}}}


{{{g-75=5n/2-25}}}

{{{g=5n/2-25+75}}}

{{{highlight(g=5n/2+50)}}}--------the container by itself is mass of 50 grams.


-
Let g=185, and find n.
{{{5n/2=185-50}}}
{{{5n/2=135}}}

{{{n=(2/5)135}}}

{{{highlight(n=54)}}}