Part A You bought a fish tank in the shape of a
rectangular prism. The dimensions are n, n+6, and n+18.
Use the formula V=lwh and algebra to write a polynomial in standard form for the volume of the fish tank. SHOW ALL WORK!!
Part B
Use your standard form equation from Part A to find the volume of the fish tank when n = 12 inches. Show ALL work
and use algebra.
Please help fast!!!

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.