exam Maths Puzzle Numerical Ability

If a bag contains 15 marbles, how many samples of 2 marbles can be drawn from it? How many samples of 2 can be drawn in which both marbles are blue?

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exam Other Question

hi! I need someone to check to make sure I did this problem correctly...
3(x-6)=(2x-7)4

Heres what I have
3x-18=8x-28
+28= +28
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3x+10=8x
-3x =-3x
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10=5x
2=x What does it mean to raise a number to a power?