The half life of radium is 1690 years. if 10 grams are present now, how much will be present in 50 years?

the correct answer is 1: 2

step-by-step explanation:

hope this your welcome : )

answer: (c) m∠qpo + (2x + 16)° = 180°

step-by-step explanation:

the opposite angles of a quadrilateral are supplementary.

so, ∠o + ∠q = 180°   and   ∠p + ∠r = 180°

since ∠r = 2x + 16°, we can use substitution as follows:

∠p + ∠r = 180°

∠p + (2x + 16)° = 180°