Answer:
the answer is D. x48......
the slope of the perpendicular line to the line through the two points is 0
Each box weighted 3/8, or .375 of a pound
(4a-12)+3a= 6a+1
Combine like terms.
7a-12= 6a+1
Add 12 to the other side.
7a= 6a+13
Subtract 6a on both sides.
a= 13
I hope this helps!
~kaikers