Please please help i’ll give brainliest tysm:))

What is the square root of 45? (step by step working plz)

Aprobability experiment is conducted in which the sample space of the experiment is s={7,8,9,10,11,12,13,14,15,16,17,18 }, event f={7,8,9,10,11,12}, and event g={11,12,13,14}. assume that each outcome is equally likely. list the outcomes in f or g. find p(f or g) by counting the number of outcomes in f or g. determine p(f or g) using the general addition rule.

What is the value of -3/4 to the 4th power? -256/81 -81/256 81/256 256/81