An experiment was conducted to determine the effects of the age of newsprint on the brightness (in percentage) of the recycled paper. Four aging periods were considered, along with five concentrations of sodium hydroxide (NaOH), used to de-ink the paper. The effect of sodium hydroxide's concentration is not of interest. The blocking variable is
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Ответ:
Step-by-step explanation:
3y - 6 = 18
3y = 24
y = 8