Mark has 5 times as many collectibles as Maria has. Subtracting 6 from the number of collectibles Mark has and then dividing by
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I am better at substitution, but you want to get the equations as similar as possible, but are the opposite, so you can cancel it out.
ANSWER
EXPLANATION
We need to use the Pythagoras Theorem to find the height of the triangle.
Take positive square root to get;
Area =½bh