How do you find the inverse of a 2x2 matrix

This doesn’t make sense to me it’s supposed to be lcm ( least common multiple )

The volume of a cone is 37x3 cubic units and its height is x units. which expression represents the radius of the cone's base, in units? 1 s o 3x o 6x obx 93x2

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line