Question

math question

Answer 1

@LynFran

Answer 2

ok i use this online calculator and got A https://matrixcalc.org/en/#%7B%7B3,6,3%7D,%7B1,6,9%7D,%7B3,6,4%7D%7D%2A%7B%7B-1,6,4%7D,%7B2,3,1%7D,%7B2,3,-7%7D%7D

Answer 3

can you multiply any of the thins to start?

Once you do a couple, you get the pattern down