√11² = ?

i do not understand what that means!

i know that √11 means "square root of 11"

i don't know this √11²!

me as soon as possible!

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?

Could someone me with this question i’ve been stuck on it for 20 minutes

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)