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If the lines intersect the position vectors r_1 and r_2 must be equal at the point of intersection, so: (1,-1,2)+a(-1,3,4)=(c,-4,0)+b(0,3,2) which gives three equations for the three components: 1-a=c, -1...

Both of these are acceptable, but I would advise writing it paragraph by paragraph, as quite often students run out of time in the exam and that way at least you've covered both sides of the argument. It ...

2x + 3

H+ ions and electrons released from NADH and FADH2,on to the inner mitochondrial membrane. electrons enter electron transport chain, and energy released from transfer of electrons is used to pump H+ ions ...

This question is to be done by integration by parts because it has "two types" of integrals. To perform integration by parts, we need to first split the function into its two parts, producing x ...