Pregunta 75

A diver swims 18 metres below the surface of the sea, and the surface is taken as height 0. Select all statements that are true about the diver's signed height in metres.

The signed height is 18, because the diver is 18 metres away from the surface.
The signed height is -18.Respuesta correcta
A position below the surface is recorded with a minus sign.Respuesta correcta
The signed height is 0, because every height is measured from the surface.

Explicación

Heights are counted upwards from the surface, so a position reached by swimming downwards is recorded below zero, and eighteen metres of depth becomes eighteen below zero. Recording the plain distance throws away the direction that the sign exists to carry, and the surface itself is the only place whose height is zero.

Explicación

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