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Calculate the relative atomic mass of an atom.

You will need to multiply the mass of each isotope (the same atom with a different mass number) by the percentage abundance of that isotope. Then, add all these values together and divide by 100. This will g...
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Answered by Emily D. • Chemistry tutor
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2(x^2)y + 2x + 4y – cos (PI*y) = 17. Find dy/dx using implicit differentiation.

This tests the students knowledge of differentiation rules as well as algebraic manipulation. Namely the product rule and implicit differentiation. Differentiate term by term and then isolate dy/dx using alg...
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Answered by Robbie M. • Maths tutor
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Use de Moivre’s theorem to show that, (sin(x))^5 = A sin(5x) + Bsin(3x) + Csin(x), where A , B and C are constants to be found.

State de Moivre's theorem. Use n =5 and solve. I'll show this on the whiteboard.
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When do you use a capital letter in German?

In German, capital letters are only used for nouns and names and after full stops. You can recognize nouns by spotting articles in front of them (e.g der, die, das / ein, eine). It is important to remember t...
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Answered by Josephine M. • German tutor
3897 Views

When do you use “a”, “as” or “à” in French?

“a” is the verb “avoir” (to have) conjugated in the present tense, third person singular (Il/elle a = he/she has). e.g : Il a du chocolat à He HAS chocolate. “as” is similarly the verb “avoir” but with the s...
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Answered by Josephine M. • French tutor
20975 Views