Question

the height of a lake decreases by 20 in over a period of time. the height decreases by 5 in each week. the equation below is written to represent the situation: -20÷(-5)=4. which description best explains the meaning of 4 in the equation? a the new height of the water in the lake is 4 in. b the change in the height of the lake is 4 in. c the time it takes for the lake to decrease in height by 5 in is 4 weeks. d the time it takes for the lake to decrease in height by 20 in is 4 weeks.

Explanation:

The total decrease in height is 20 inches and the decrease per - week is 5 inches. When we divide the total decrease (-20) by the decrease per week (-5), we get the number of weeks it takes for the total decrease to occur. So 4 represents the number of weeks it takes for the lake's height to decrease by 20 inches.

Answer:

D. The time it takes for the lake to decrease in height by 20 in is 4 weeks.