Mathew would get $15 (60%) and luke would get $10 (40%)
I'm not sure why options a. and d. are the same, but you would simply count the number of times x and m appear, while being multiplied together, and multiply the product of xm by that number. in this case, the number is 7, so you should get 7(xm) or 7xm.
Answer:
D. taking two marbles from a box without replacing the first marble are dependent events

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The ratio of volumes is the cube of the scale factor.
Prism 2 has a volume of (24 cm³)×(1/2)³ = 3 cm³