Question 99529
ok the formula for the volume of a rectangle box is length times width times height. or 
{{{(L)(W)(H)=Volume}}}
Ok so lets plug in the given information.
{{{(6)(3.5)(H)=105}}}
first multiply 6 times 3.5
{{{(21)(H)=105}}}
now divide both sides by 21
{{{(21H)/21=105/21}}}
{{{H=5}}}
and so H = 5 inches

To check the answer just use the formula {{{(L)(W)(H)=Volume}}}
and plug in all the values so
{{{(6)(3.5)(5)=105}}}
{{{(21)(5)=105}}}
{{{105=105}}}