Explanation:
Relative density is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material (i.e., water). It is usually measured at room temperature (20 Celcius degrees) and standard atmosphere (101.325kPa). It is unitless.
Answer:
38) "Te voy a escribir una carta"
39) "Voy a jugar el sábado y descansar el domingo"
40) "No seas malo."