A=[1 2 3 4
    9 8 7 6
    5 -1 13 -100
    4 12 1 1]
m=[7; 5; 3; 1]
determinant=det(A)
poordmaatriks=inv(A)
transponeeritud=A'
C=2*A+A.*A+inv(A)*A
B=A*m
vastus=A(1,3)+C(3,2)-4*m(4)
