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    What is 5^n=80n

    I've got a problem with this: 5^n=80n find n! I can't solve out this one. thanx for ur help, I'm not sure if it's the right place for this thread.
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    Integral equation

    what does an equation need so that the equation can be integrated? not all of equation can be integarted right? I was quite confuse if it can be integrated or not whether I found a difficult integration. Thanx
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    Integral of sqrt(x^3 -1) dx

    integral of sqrt(x^3 -1) dx. I have tries it with trigonometri subs, but I only found till integral of 2/3(sin^5/3 (tetha) / cos^2 (tetha) ) d(tetha)
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    Volume problem

    problem: find volume bordered by cylinder x^2 + y^2 = 4 and y+z=4 and z=4. the answer is said to be 16p. but I couldn't find it. I found it in double integral it must be solved with double integral. I tried with Jacobian tranformation. nut still couldn't solve it. I was confused...