Question 247770
Get yourself a calculator and learn how to use it.
Limit yourself to one problem per question.
Six problems all at once is absurd.

There is no excuse for a response such as "I couldn't find the square root on the computer 2 put x under)
"Be sure to reject any value of x that produces the logarithm of a negative number" Do you know why? Because they can't exist.
9^X-1=4 
Is that raised to the x-1 power or just to the x power?
If it is to the x-1 power (more likely) then it should be 9^(x-1)=4

Also try to type your words as they really appeared in the problems.