- What did the first mammals evolve from?

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What is cycle time for astm? 7^(x+1) + 7^x + 7^(x-1) = 399, what is x? How many 2 cubic ft. bags of mulch to fill a space that is 30 ft. x 16 ft. x 3 in's deep? Find a positive angle, less than 360 degrees, that is coterminal with a 1715 degree angle. Please show steps!!? Make a conjecture about the next item in the sequence.1, -4, 9, -16,?