- Invalid pen#,how do I find out which is valid?

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What is the ratio of the measure of one angle of a rectangle to the sum of the angles of a rhombus? 12 waves pass you every 45 s. If the distance from one crest to the next is 5.4 m , what is the speed of the waves? Initial temp. of a cup of tea is 200ºF. The surrounding temp. is 70ºF, and the constant k is 0.6. the temp. after 2 hours will be in ºF? What is the volume in mL of 0.887 kg of mercury? (Density of mercury is 13.56 g/cm3)? Chloroplasts isolated from land plants are unstable and lose activity very quickly. What is the reason for this?