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Turn x-y=6 into y=6+x.2) Insert y=6+x into 2x+y=18; get 2x+6+x=183) Turn the latter equation into 3x=18- 6=124) Divide 12 by 3 to get x=45) Insert x=4 into y=6+x into y=106) Conclude with x=4 and y=10

Start by expanding out the bracket on the top of the fraction to get (6x+4)/(3x 2 +4x+9). Then using the trick of identifying that the fraction is in the form [g(x)]/[f(x)] where f’(x)=g(x), the solution is ...

A species with an unpaired electron, that is very reactive. For example, oxygen radicals involved in ozone depletion.

The time taken for half of a given amount of radioactive substance to decay.

In prophase I of meiosis, homologous, non-sister chromatids form connections called chiasmata at matching loci. The complex then splits to give chromatids with different combinations of genes than were prese...