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The atomic number, Z, is the number of protons in the nucleus. The mass number ,A, is the total number of protons and neutrons in the atom.

Equation one: 3y - 7x = 15

- Double it and re arrange   3y - 7x = 15 goes to 3y = 7x + 15 goes to 6y = 14x + 30 we name this equation 3

Equation two: 2y = 4x +12

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Start with looking at the form of the poem: things like the number of stanzas, how many lines they are composed of, and how they are arranged, as well as the overall length. Do not just state the arran...

J'ai 18 ans. Et toi, quel âge as tu ? 

The subjunctive has always been a slightly misunderstood part of French grammar. It differs from tenses such as the present and future, as it is described as a 'mood' and is used to express doubt, uncerta...