For 8 days of very hot weather, the water level in a lake dropped 3 inches per day. on the ninth day, storms raised the level 6 inches. write and find the value of an expression for the change in the water level of the lake during these 9 days.

During the span of 9 days, the water level of lake decreased by 18 inches.      

Step-by-step explanation:

We are given the following information in the question:

For 8 hot days, the water level decreased in a lake at rate of 3 inches per day.

Then on day 9, there was a storm that increased the water level by 6 inches.

Total drop in water level in lake =

Expression for the change in the water level =

Hence, during the span of 9 days, the water level of lake decreased by 18 inches.

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