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m0286

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**Can some one check my answers please?**

The answers are in my reply post at the bottom of this page THANKS

I have a couple more log questions I am stuck on. They keep giving me log questions that they never showed me how to do.. very fustrating!

I need to evaluate the following logarithms:

68 a). log22^log55

I don't even know where to begin.. I never done a log with an exponent log?

69. log25=log2(x+32)-log2x

Determine the derivative of:

70 c) y= 2x^3 e^4x

e) y= square root(x^3 + e^-x +5)

I know this one should probably go to. (x^3 + e^-x +5)^1/2... then,

dy/dx= (x^3 + e^-x +5)^1/2 * 1/2(x^3 + e^-x +5)^-1/2 * (3x^2)now I am confused? does the e^-x have a derivative?? like -xe^-2?? i got no idea.

CAN ANYONE HELP ME PLEASE...

THANKZ YA!

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