exam Maths Puzzle Numerical Ability

The percent I(x) of the original intensity of light striking the surface of a lake that is available x feet below the surface of the lake is given by I(x) = 100e^-0.95x.
a. What p

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This has made me lose sleep:
Solve the logarithmic equation. be sure to reject any value that is not in the domain of the original logarithmic expression. give the exact answer:
log2(x-1)=1+log2(x-5) (2 is lower)

Thanks much Find the equation for the line with slope 1/2 and y intercept 3. Possible answers: A. x/2-y=3; B. -x+2y=6; C. x+2y=6; D. 2x-y=3