Which expression represents a perfect square monomial and it’s square root? Check all that apply

121; 11

4x^2; 2x

9x^2-1; 3x-1

25x; 5x

49x^4; 7x^2

How many different ways can you make change for $.50 using only nickels,dimes, and quarters?

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?