Which situation cannot be represented by this equation?

−13+15=9

3 of the following are correct. which one isn’t.

the water level in a tank measures 15
15
inches and is decreasing every 13
1
3
of a minute.

at what rate,
x
, does the water level need to decrease per minute to reach a depth of 9
9
inches?

the water level in a tank measures 9
9
inches and is rising 13
of an inch every minute.

how many minutes,
, will it take for the water level to measure
15
inches deep?

the water level in a tank measures 15
15
inches and is decreasing 13
1
3
of an inch every minute.

how many minutes,
x
, will it take for the water level to measure 9
9
inches deep?