What is the completely factored form of x^4+8^2-9?

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x,y) ?

The number of chocolate chips in an 18-ounce bag of chocolate chip cookies is approximately normally distributed with a mean of 1252 chips and standard deviation 129 chips. (a) what is the probability that a randomly selected bag contains between 1100 and 1500 chocolate chips, inclusive? (b) what is the probability that a randomly selected bag contains fewer than 1125 chocolate chips? (c) what proportion of bags contains more than 1225 chocolate chips? (d) what is the percentile rank of a bag that contains 1425 chocolate chips?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?