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Draw a diagram that represents the electronic arrangement of a fluorine atom.

Electrons are arranged in different shells (sometimes described as an energy levels) around the nucleus with the innermost shell being filled first and then working outwards. The first shell can hold a maxim...
IA
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A car costs £5,899.99, not including VAT. If the VAT rate is 20% how much does the car cost in total?

100% = £5,899.99 10% = £590.00 £590.00 x 2 = £1,180.00 £5,899.99 + £1,180.00 = £7,079.99
HT
Answered by Helen T. • Maths tutor
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I did a question the other day which expected me to know what cos(30) is without a calculator. How do I work it out?

There are certain angles that you can use shapes and trigonometry to work out what their cosine, sine and tangent angles are. These angles are 30, 45 and 60 degrees and there are 2 very simple but important ...
PH
Answered by Philip H. • Maths tutor
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What is the difference between "tu" and "usted" in Spanish?

When speaking in Spanish, there are two way of saying "you" when you are talking to a single person - "tú " and "usted" . The difference between these two is that the first, &qu...
IC
Answered by Isabel C. • Spanish tutor
36014 Views

is x + x equal to x^2 ?

No. Think of an x as a tangible object, for instance an apple. If you have an apple plus another apple, you have 2 apples. Therefore if you have an x you have 1x. 1x plus another 1x is 2x, not x^2.
RC
Answered by Rosalie C. • Maths tutor
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