Math Placement Exam practice

<p>I just did it and there are a few problems that are stumping me. It's simple stuff it's just been a while since I've done it. Can somebody please explain how to get the answers to the following questions?</p>

<p>x^2-14x>15 is equivalent to ?</p>

<p>7^x = 3, x = ?</p>

<p>t = e^(x+2), x = ?</p>

<p>((x^2-4)/(5x))*(30/(3x-6)) = ?</p>

<p>8^(2/3)*16^(1/4) = ?</p>

<p>log base10 s = 4, s = ?</p>

<p>Thanks!!</p>

<p>quadratic equation (if you want to solve for x)
logarithms
logarithms
simplifying
powers and roots
logarithms</p>