Need help with Precal Review Questions (Test this week)

Hey guys, I have a Calculus test this week that covers some Precal materials and I am not quite sure whether the answers I got on a couple of my review problems are correct.

T/F

1. If f(s) = f(t), then s = t.

2. If X1 < X2 and f is a decreasing function, then f(X1) > f(X2).

3. If f and g are functions, then f o g = g o f.

4.You can always divide by e^x.

5. If x>0, then (ln x)^6 = 6 ln x.

6. The parametric equations x = t^2, y = t^4 have the same graphs as x = t^3, y = t^6.

7. Express the function F(x) = 1/sqrt{x + sqrt{x} } as a composition of three functions.

Any feedback or help would be greatly appreciated.