$10 for the first one
+ $8 for the second
+ $8 for the third
+ $8 for the fourth
+ $8 for the fifth
= $42
So we're looking for the answer that gives us 42 when we plug in the number we chose above.
We can translate that to
10 + (5 - 1)(10 - 2) = 10 + (4)(8) = 42.
That's our answer! Make sure, when you plug in, that you try the other answers too to make sure they don't work. In this case they don't, so we're done.
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