x=8+sqrt-8/12, x=8-sqrt-8/12
I think...
B could not be the coordinates.
I drew a sketch
9514 1404 393
Answer:
316 lumens/m²
Step-by-step explanation:
We assume your intensity function is ...
f(x) = 50,000(0.975^x) . . . . x meters below the surface
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Use 200 for x and do the arithmetic.
f(200) = 50,000(0.975^200) ≈ 316 . . . . lumens/m²
I think you have to divide 80milion and 84
