Answer:
$13.75 i hope this helps! :)
Explanation:
if one pound of walnuts us 2.50, then a half a pound of walnuts is 1.25
so we can multiply 2.5 by 5 to pay 12.5 then we need to add the .5 pound
1.25 added to 12.5 is 13.75
$13.75 for 5.5 pounds of walnuts