Question 1179601


The cost ({{{c}}}) of materials for a deck varies jointly with the width ({{{w}}}) and the length ({{{l}}}). 

{{{c=k*w*l}}}

if {{{c=424.80}}} when {{{w=18}}} and {{{l=10}}}, use it to find{{{ k}}}

{{{424.80= k *18 *10}}}
{{{424.80= k *180}}}
{{{k=424.80/180}}}
{{{k=2.36}}}

so,  when{{{k = 2.36}}}, {{{w=7}}},and {{{l=22}}}, the cost would be 
{{{c=2.36*7*22}}}
{{{c=363.44}}}