Adding & Subtracting Matrices

Mathgirl hangs out with Andrea and Nathalie and adds some matrices... not the car... or the movie...

[rfm]

Felt like was studying abroad in Puerto Rico. Awesome.

[soccerlaughlive]

You guys are funny (;
Thanks for the vid..I understood it.totally!

[senjunarukurama]

Negative 1 minus negative 1 is negative 2

[TThapelo]

no its not. take a calculator and delete your comments before more people see. the prob was -2-5 which is -7 not -3