Use the following matrices for the computations below 1 -1 2 1 -2 0 -1 4 5 0 -1 a) compute a+c. [-2 -2 4] b) compute ab. if this product is undefined, explain why. c) compute ba. if this product is undefined, explain why

Which multiplicative property is being illustrated below? (type commutative, associative, or identity) 5 × 2 × 4 = 2 × 5 × 4

7. the area of the playing surface at the olympic stadium in beijing isof a hectare. what area will it occupy on a plan drawn to a scaleof 1: 500?

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?