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How do you find the power of a number equal to a fraction? For example, 2^x = 1/8 without the use of a calculator? Can someone help me with the math question about arithmetic sequence? a3=13, a13=43. Find a17? I saw brehme at the gashouseeee what was he doing there? CaCO3+ 2HCl → CaCl2+ H2CO3.cause this is a 2:1 reaction how will that affect the number of moles you calculated for the base in the antacid? The wavelength of an electron moving with speed 1.5x10 8 m/s is (give value of answer in m, using scientific notation)?