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The Spanish speaking exam has to demonstrate strong content, and vocabulary, so my first suggestion would be to revise bullet points with good vocabulary on all the topics that might come up. Reading arti...

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...

[add 4 to both sides] 2x=10 Therefore, x=5

Atomic Number: Number of Protons in the nucleus of the atom, also equal to the number of electrons in a neutral atom.

Mass Number: Total number of "nucleons" (Protons and Neutrons) in the...

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 ...