How do you solve 21r < 7?

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According to astronomers, the age of the universe is estimated to be (1) 1.3 billion years (2) 4.6 billion years (3) 7.9 billion years (4) 13.8 billion years

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5. Name three sets of supplementary angles. and and and

What distinguishes mass from weight? a. mass is a measure of the amount of matter in an object, while weight is a measure of the force of gravity on the object. b.