Answer:
11.45 lumens
Step-by-step explanation:
We are given that

Where x=Depth
I=Intensity of light
We have to find the intensity of the light at a depth of 20 feet.
Substitute the value of x





Hence, the intensity of the light (in lumens) at a depth of 20 feet=11.45 lumens
Answer:
the answer is b
Step-by-step explanation:
b is 9 thank you
That would be the zero identity property. Hope it helps!
Divide each term by 3.5 to get x=4.