Who want a 1v1 in shell shockers

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

Given that s is the centroid of triangle mno, find sq.

Carli has 90 apps on her phone. braylen has half the amount of apps as theiss. if carli has three timesthe amount of apps as theiss, how many apps does braylen have? let b represent the number of braylen's apps and t represent the number of theiss's apps.