Which expresses 9x^2y^2 as a perfect square

a: (3xy)^2
b: 9x
c: 3xy
d: 3x^2y^2

Select the quadratic that has root x = 8 and x = -5

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

Kayla made observations about the sellin price of a new brand of coffee that sold in the three different sized bags she recorded those observations in the following table 6 is $2.10 8 is $2.80 and 16 is to $5.60 use the relationship to predict the cost of a 20oz bag of coffee.