Analiza cada situacion y responde las preguntas. a) ? que numero se encunetra 4 unidades a la izquierda de 1-? ? cuel es su opuesto? .

We must answer the question:

What number is founded 4 units to the left of 1?

You can find this number by the equation x = 1 - 4 = -3

then the answer is 3 (tres).

The squander question says:

which number is the opposite?

The opposite of a real number is the same number with the sign changed, so the opposite of 3 is -3 (menos tres).