Which of the following is best described as sets of three whole numbers (a, b,
and c) that satisfy the equation a2 +62 = c2?
A. Prime numbers
B. The Pythagorean theorem
C. Perfect squares
D. Pythagorean triples

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

Apublic library wants to place 4 magazines and 9 books on each display shelf. the expression 4s+9s represents the total number of items that will be displayed on s shelves. simplify the expression