- Number of moles in a pound?

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I need help trying to solve this exponential equation: 2^x-10(2^-x)+3=0? The sum of the first 7 terms of an AP is 63 and the sum of its next 7 term is 161. find the 28th term of this? Find the exact area of the surface obtained by rotating the curve about the x-axis.
y = sqrt(1 + 3x) , 1 ≤ x ≤ 3? Chemistry question which of the following compound would you expect to show dispersion forces? dipole forces?
a) F2
b) CO
c) CO2
d) H2CO? What is some information about human-made minerals?