Which products result in a difference of squares? check all that apply.
(5z + 3)(–5z – 3)
(w – 2.5)(w + 2.5)
(8g + 1)(8g + 1)
(–4v – 9)(–4v + 9)
(6y + 7)(7y – 6)
(p – 5)(p – 5)

The number of chocolate chips in a bag of chocolate chip cookies is approximately normally distributed with a mean of 12611261 chips and a standard deviation of 118118 chips. (a) determine the 2626th percentile for the number of chocolate chips in a bag. (b) determine the number of chocolate chips in a bag that make up the middle 9696% of bags. (c) what is the interquartile range of the number of chocolate chips in a bag of chocolate chip cookies?