Identify the like and unlike terms: (i) 3a,3b,4a^2,7a,-5b
(ii) xy^2,yz^2,zx^2,3y^2 x,4z^2 y
(iii) abc, bca, ab^2 c, acb^2,cab
iv) 3x^3 y^3 z^3,xyz,-5x^3 y^3 z^3,12abc,4xyz
i will give 30 points if u answer. no not related answer will report n block
thanks

What is the base of 1/9 to the power of 2

Icould really use some with this question.

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?