To find an inverse matrix you first have to find the determinant and then put the absolute value of it under a 1. That's what is sitting outside in front of all those matrices. What you have to do now is multiply that determinant by what I teach to my students as the "mixed up matrix". They always remember from that. Change the position of the terms on the major axis (here they are a and d), and then switch the signs on the other 2 terms. Our inverse matrix then is
Answer:
A.
36 hours
Step-by-step explanation:
12h=432
432/12= 36
Joanne worked 36 hours
The answer to this problem is 9.
-6+(-3)-(-18)
Since (+)(-)=(-) and (-)(-)=(+),
-6-3+18
-9+18
9
Answer:
Its A
Step-by-step explanation: