Why are 45 degree 45 degree 90 degree and 30 degree 60 degree 90 degree called special right triangles?

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?

Which graph represents the parent function of y=(x+2)(x-2)

If f(x) and g(x) are inverse functions of each other, which of the following shows the graph of f(g(x)