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Define the terms atomic number and mass number

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.
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Answered by Laura B. • Chemistry tutor
9033 Views

Solve the following simultaneous equations to find the values of x and y: 3y - 7x = 15 & 2y = 4x + 12

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 - Triple it. so..6y = 12x + 36 we name this equ...
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Answered by Imogen P. • Maths tutor
4706 Views

How do I approach an unseen poem?

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 arrangement...
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Answered by Iwan E. • English tutor
2127 Views

Quel âge as tu ?

J'ai 18 ans. Et toi, quel âge as tu ?
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Answered by Alyette T. • French tutor
6249 Views

When do I use the subjunctive?

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, uncertaint...
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Answered by Frankie F. • French tutor
2981 Views