Determine if the given matrices are inverses. Answer yes or no.
[1 0.4 1 ] [3 12.5 2]
[1.2 0 0.8] [-1.6 2 -1]
[-1.6 0.2 -1] [ 5 1 -10]

Question

Determine if the given matrices are inverses. Answer yes or no. 
[1       0.4    1 ]         [3    12.5   2]
[1.2    0     0.8]     [-1.6      2    -1]
[-1.6  0.2   -1]        [  5       1    -10]

anonymous · Answer

I think it the answer is no because some of the numbers aren't reciprocals of each other

anonymous · Answer

answer is no.

anonymous · Answer

Its no

anonymous · Answer

Can someone explain why it is no?

anonymous · Answer

Yes I am allowed to use a calculator

anonymous · Answer

well,  some of the numbers aren't reciprocals to each other like you said.

anonymous · Answer

So all you do is multiply?

anonymous · Answer

I have a graphing calculator but I don't know how to compute matrices on it

anonymous · Answer

if the determinant is not 0, then the matrix has an inverse

anonymous · Answer

A and B are inverses of each other if AB = BA = I, where I is the identity matrix