1 + (-5) becomes 1 - 5 because you are adding a negative number.
1 - 5 is -4
The volume of rectangular prism is the product of its length, width and height.
So the volume V of prism with length

yards, width

yards and height of 4 yards will be:

Thus the volume of prism as a mixed number in simplest form will be

cubic yards
8 hundred thousands and 1 thousand.
75*.2=15
you would save $15
hope that helps