Algebraic Expressions are these correct

1. Five times the difference between 6 and a number.

My answer 5(6-n)

#2.Nine times the sum of a number and 5.

My answer 9(n+5)

#3.Eleven less than a number n

My answer

N-11

#4.Twice the sum of a number and 19

My answer
2(n+19)

Perfect (:

Yea these are absolutely right.
If these were done by you without help of anyone, then you are good in algebra (up to your grade).

yes
yes
yes
yes

Good Good = Good^2

exactly
Good work!

Looking good.