The answer is 1000 cubic feet either. The reason for that is fallowing:
Imagine you cut cube 2 peaces so that your cut is normal to bases and it passes throught both bases. If you take those 2 pieces and switch their position and stick one to another you will get non tilted original cube.
what you can conclude from this is that tilting doesnt influence volume if bases and height remain the same.
The standard form:

The slope-intercept form:

m - slope
b - y-intercept
We have m = 3 and b = -5.
Substitute:
subtract 3x from both sides
change the signs

First you see how it goes up 6 each time this is the start of your nth term rule
6n
Then -6 from the first term to get the ‘0th term’ 1-6=-5
So nth term rule is
6n-5
hope this helps
Answer:
7b-12
Step-by-step explanation:
12b-5b-7-5
7b-12