47 rounded to the nearest 10th is 50
1760/40 = 44
He covered 44 ft^2 per lb.
2640/60 = 44
Again, he covered 44 ft^2 per lb.
In both cases, he covered 44 square feet per pound.
To cover 4480 sq ft, he needs:
4480/44 = 101.818181... = 101 9/11 pounds
The simplest vector you can take along the x-axis is
.
Now,
where
is the angle between the two vectors. You have
so that
-1.6 , -6/5 , -0.875, 0.9, 2.5
The negative number many seem high but since the greatest negative number is closer to zero it is higher than the other negative numbers.