During the summer months, the water level in Marra’s pool decreases by about 1/2 inch each day due to evaporation. Which equation shows the approximate total change, in inches, to the water level in her pool after 30 summer days?

3 answers

To find the total change in the water level of Marra's pool after 30 days, we will multiply the daily change (which is a decrease of 1/2 inch) by the number of days (30).

The equation for the total change in water level (in inches) after 30 days can be expressed as:

Total Change=Daily Change×Number of Days

Substituting in the values we have:

Total Change=(12)×30

So, the equation that shows the approximate total change, in inches, to the water level in her pool after 30 summer days is:

Total Change=12×30

Calculating this gives:

Total Change=15

Thus, the water level in Marra’s pool decreases by approximately 15 inches after 30 days.

During the summer months, the water level in Marra’s pool decreases by about 1/2 inch each day due to evaporation. Which equation shows the approximate total change, in inches, to the water level in her pool after 30 summer days?

A-1/2(-30) =15
B 1/2 (30) =-15
C -1/2(30) = -15
D. 1/2(30) =15

To find the total change in the water level of Marra's pool after 30 days, considering that the water level decreases by 12 inch each day due to evaporation, we should use a negative sign to indicate a decrease.

The correct equation that represents this total change after 30 days would be:

Total Change=12(30)

Calculating this yields:

Total Change=15

This matches with option C:

C. 12(30)=15

So, the correct answer is C.