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7^(x+1) + 7^x + 7^(x-1) = 399, what is x? Find a positive angle, less than 360 degrees, that is coterminal with a 1715 degree angle. Please show steps!!? If a+b+c=4, ab+ac+bc=6, and abc=3, what is 1/a + 1/b + 1/c? 15.00g of Si reacts with 25.00g of F2 to produce 28.67g of SiF4. Which reactant is the limiting reagent? How many 2 cubic ft. bags of mulch to fill a space that is 30 ft. x 16 ft. x 3 in's deep?