Para dos números enteros “a” y “b” en que “a” y “b” NO son simultáneamente ceros, se define la operación: a • b = ab • ba Entonces, según se define la operación, ¿cuál es el valor que resulta de 3 • -1?

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step-by-step explanation:

the answer is mp

step-by-step explanation:

the diagram shows you   triangle def with de=4, df=9 and de≠df≠ef.

the sum of the lengths of two triangles' sides are always greater than the length of the third side:

substitute sides lengths:

then 5< ef< 13 (option 3 is true).

def is a scalene triangle with all sides of different lengths (option 5 is true, option 2 is false).

answer: correct choices are 1, 3 and 5