D a quadrilateral with one pair of parallel sides
The formula for half-life is:

A is the amount remaining, P is the initial amount, t is the time that has passed, and h is the half-life of the substance. Plug in the values that you know and solve:

Rounded to the nearest whole number, the density of the substance was about 13<span>mg / cm².</span>
Answer:46
Step-by-step explanation:if a =6, then a^2 would be 36, and if you add b(10) to that, you get 46
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