Which situation cannot be represented by this equation? -13x+15=9 a-the water level in a tank measures 1515 inches and is decreasing every 1313 of a minute. at what rate, xx, does the water level need to decrease per minute to reach a depth of 99 feet? b-the water level in a tank measures 99 inches and is rising 1313 of an inch every minute. how many minutes, xx, will it take for the water level to measure 1515 inches deep? c-the water level in a tank measures 1515 inches and is decreasing 1313 of an inch every minute. how many minutes, xx, will it take for the water level to measure 99 inches deep?