i think it happens for everyone (maybe to varying degrees) especially near this time of the term and especially in yr11/12 where ur expected to do much more work
a newspaper from the time period would probably include a written source, a photograph and maybe a cartoon so that might be a good option.
maybe from the british newspaper archive?
a secondary source could probably just be from any website or use google scholar or something similar for more...
imagine theres a second graph, y = k (so its just a horizontal line at with y value of k)
then the number of points where f(x) = k are the number of intersection points
so if k was 18, there would be a horizontal line near the top of the graph that intersects the graph twice so 2 solutions
multiply by avogadro's constant?
u could think of the mass as being in g/molecule
so to get to RMM (in g/mol) multiply by molecules/mol so the molecules cancel
and molecules/mol is avogadro's constant i.e. there are ~6.02*10^23 molecules in one mole of those molecules
what if u just move the rhs to the left and thus before integrating cancel the a^x and b^x terms in the expansion and just explain the rest of the terms must be positive as a,b,n are positive