1. The combined volume of all the tanks at the aquarium is written in Scientific notation. Keeping this on mind, you can write it as following:

2. Now, you must sum the combined volume of all the tanks and the volume of the new tank to calculate the total volume of all of them:
3. Now, you can write the result in Scientific notation, as following:

The answer is: 
8(51) = 8(50 + 1) = 8(50) + 8(1) = 400 + 8 = 408
Answer:
f^-1(x) = x+1
Step-by-step explanation:
y = x-1
x = y-1
y = x+1
I think it’s the first one
The answer should be
780x + 1500y=31000
please correct me if i'm wrong