Element X decays radioactively with a half life of 10 minutes. If there are 760 grams of Element X, how long, to the nearest tenth of a minute, would it take the element to decay to 39 grams?

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Need on this geometry question. explain how you did it.

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.