book Maths Puzzle Numerical Ability

i would like to know what is a
nuamrical expretion , algperic expretion
and all the proprties
ex:additive properties , multuplactiv proprties , assoiative properties ,
addit

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book Other Question
i have 3 points on a graph that form a triangle and i need to find the area of the triangle using a matrix. How would i find the area? the points are (-2,-2), (3,0), and (2,4). I am sooo lost the question is this determine the correct half-plane in each case. x+y<5

Thank you so much
Brandi