- Pocket monsters card number 31 value in the 1996?

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Find a-1 & r for the geometric sequence a-3=60, a-7=0.006 Please help I'm lost for what a-1 OR r equals? A right triangle has acute angles of 30 degrees and 60 degrees. The hypotenuse has length 3. What are the length of the other two sides? With formula S-n Find sum of first five terms geometric sequence 20, -4, 4/5, -4/25? Air contains nitrogen and oxygen in the ratio 4 is to 1 the average molecular weight of Air is? 1.0g/cm3 = ? l/h?