Is this true or false pls help ill give brainliest if its right

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

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list