Four 4's

Using arithmetic combinations of four 4's express the numbers from 1 to 10.
You must use all four 4's for each number.
You may combine the 4's using the arithmetic operations +, -, * (multiplication) and / (division).
You are also allowed to use sqrt (square root) (e.g. sqrt(4)=2, sqrt(4/4)=1).
You do not need to use concatenation (e.g. 44), decimal places (e.g. 4.4), factorials (e.g. 4!), or trig functions such as sin or cos.

CM is good, MC is bad.
C is good, M is bad.
IX is good, XI is bad.
L is bad, I is good.
Why?

1/Make 4 out of 2,5,6, and 8.

2/Make 40 out of 4,6,8, and 8.

Fs xlt bzk oazr qdfp, cfua xltopais z mzq lk qda ezbh.

Clue : substitution keyword ZEBRAS.