Pe multimea numerelor reale se defineste legea de compozitir asociativa data de x * y = x + y - 2

a) calculati 5 * (-5)

b) aratati ca legea de compozitir * este comutativa

c) calculati (-3) * (-2) * (-1) * 0*1*2*3

Write a formula to find the surface area of a rectangular prism.

1. What is the slope of a line parallel to the line whose equation is y = 2/5x - 3?

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