Darnell rented a moving truck. the weight of the empty truck was 7,860 pounds. when darnell filled the truck with his items, it weighed 6 tons. what was the weight in pounds of the items was darnell placed in the truck? show the work

1 ton = 2000 lb
Multiply by 6.
6 ton = 12,000 lb

The problem statement tells you 
  (truck weight) + (Darnell's items) = 12,000 lb
  7,860 lb + (Darnell's items) = 12,000 lb

Subtracting the weight of the truck gives
   (Darnell's items) = (12,000 -7,860) lb = 4,140 lb

The weight of items Darnell placed in the truck was 4,140 lb.

First subtract 10 from both side
y^2+6y-16=0
(y+8)(y-2)=0
-8 and 2

$22. if larry's profit were to minimize by one for every hour his store were to be closed, we would subtract 30 by 8.