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Expand and simplify 2(a + 3) + 5(a – 1)

Firstly we will start by expanding the brackets. We will do 2a + 23 for the first bracket, then we will do 5a + 5(-1) for the second bracket which will give us 2a + 6 + 5a - 5. We will ...

Answered by Serena B. • Maths tutor

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How can I get 8 points out of 8 in Question d of the Economics HL Paper 2?

It is important that you always get back to article and you develop the arguments mentioned. If for example, you get a question on how to cure a curernt account deficit, I would suggest to:

Answered by Giuseppe E. • Economics tutor

1940 Views

I don't understand why carbon forms 4 bonds but nitrogen doesn't form 5.

Carbon has 4 electrons in its outer shell, a pair in the 2s and two unpaired electrons in the 2p. For covalent bonds to form, each atom must donate one unpaired electron. Carbon makes four bonds because i...

Answered by Ryan H. • Chemistry tutor

11445 Views

Explain 2 features of a pluton/surrounding country rock that may influence the width of themetamorphic aureoles

When a pluton (essentially a large pocket of magma) intrudes into rock, the heat from the pluton 'bakes' the surrounding rock- remember that heating a rock to high temperatures will initiate contact metam...

Answered by Demi S. • Geology tutor

7278 Views

Elements in the periodic table show a trend in atomic radius. State and explain the trend in atomic radius from Li to F.

The atomic radii of an atom is essentially the distance from the centre of the nucleus to the outer shell of electrons- so atoms that are very small and have a small distance from the nucleus to the outer...

Answered by Demi S. • Chemistry tutor

9199 Views