In a certain marine zone, the intensity I of light d feet below the surface is given approximately by  figure 1.png)
where I? is the intensity of light at the surface. To the nearest percent, what percentage of the surface light will reach a depth of 15 feet?
What will be an ideal response?
66%
Mathematics
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Determine the quadrant containing the terminal side of ? under the given conditions.sin ? > 0 and cos ? < 0
A. Quadrant II B. Quadrant I C. Quadrant IV D. Quadrant III
Mathematics
Solve the system of equations by the substitution method.
A. (-6, 6) B. (-7, 7) C. (7, -7) D. no solution
Mathematics
Perform the indicated operation and simplify.
+ 
+ 
A. 
B. None of these
C. 
D. 
Mathematics
Evaluate.(-9)2
A. -81 B. 18 C. -512 D. 81
Mathematics