Solve for all values of r 3r/r-5 - 2/r+3=r/r+3

Does anyone know of a quizlet or something for edmentrum /plato algebra 1

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

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?