1) De la suma de x 2 + 5 con 2x – 6 restar la suma de x - 4 con x + 6 2) Restar la suma de 3x 2 – y 2 con -11xy + 9y 2 – 14 de la suma de x 2 - 3xy – y 2 con 9y 2 – 8xy + 19x 2
3) Multiplicar a 3 – 3a 2 b + 4ab 2 por a 2 b – 2ab 2 -10b 3
4) Dividir x 6 + 6x 3 – 2x 5 – 7x 2 – 4x + 6 entre x 4 – 3x 2 + 2

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?