Answer:
It'll be at 35 feet in 10 days.
Step-by-step explanation:
since the water level is receding, we change 0.5 to -0.5
we have to add 40 feet, since the water level is 40 feet
w represents 35 since we need to find the number of days the water level will be 35 feet
since w represents total (feet) water and d represents days, we can set up the equation
d = days = -0.5
w = total (feet) water = 35
w = -0.5d + 40
35 = -0.5d + 40
35 - 40 = -0.5d + 40 - 40
-5 = -0.5d
-5/-0.5 = -0.5d/-0.5
10 = d
It'll be at 35 feet in 10 days.
