Question

Decide whether matrix addition and multiplication are associative. Justify your answers.

Answer 1

regular addition is associative, and since you add in matrices component wise, that is associative as well

Answer 2

if you ever run across something that is not associative, run
you will be in big trouble

Answer 3

so are they? @satellite73

Answer 4

oh yes

Answer 5

matrix addition and multiplication is associative
matrix multiplication is not commutative
https://www.khanacademy.org/math/precalculus/precalc-matrices/properties-matrix-multiplication/v/associative-property-matrix-multiplication

Answer 6

don't you mean matrix multiplication is not associative