Final answer:
To find the total mass of six marbles, you multiply the mass of one marble (18.5 g) by six. The calculation shows that the total mass is 111 g.
Step-by-step explanation:
The question asks for the mass of six glass marbles, given that one glass marble has a mass of 18.5 g. To find the mass of six marbles, you would multiply the mass of one marble by six.
Mass of one marble = 18.5 g
Number of marbles = 6
Total mass of six marbles = Mass of one marble × Number of marbles
Total mass of six marbles = 18.5 g × 6 = 111 g
The correct answer is d. 111 g.