Sent a picture of the solution to the problem (s).
1, 3, and 5 would be my best guesses but I’m not 100 percent sure
Additive indentity

n = 1
a variable is always a number itself remember 7+n
5+2 = 7
You know that every 10 minutes the oil moves 25 meters so and in 1 hour there are 60 minutes the equation is 60/10(25) and then you solve
The answer is 150 meters squared