Given matrix a= [5/2 1/1] and matrix b= [1/3 2/1], find each of the following operations : a•b, a+b, det (a), and b^-1

Pam buys a sleeve of ball bearings for her skateboard. each of the bearings is 1 1/5 inches wide. the sleeve is 9 3/5 inches long. how many ball bearings are in the sleeve? show your work.

Issof claims that the scale factor is 1/2. which statement about his claim is correct

If 3x+8=3x+8 is it one solution or no solution