An n x n matrix is a(n)
___ of another 2 x n matrix when their product is an identity matrix.

The monetary value earned for selling goods or services to customers is called a.) revenue b.) assets c.) money d.) accounting

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

Can someone tell me if this is perpendicular? !