1. Plug in x = 0, what sign does it have?

If f(x) is continuous, f(a) < 0 but f(b) > 0 then f(x) must cross the x-axis.

2. Is f(x) continuous? If yes then f(x) as x->0 = f(0)

3. Let m = exp(log base e 25)

Take log of both sides on base e. What is m?

4. log base2 (X^(log base2 X))=4

X^(log base2 X) = 16

If y = log base 2 X, what is X in terms of Y? Put that in the equation.