Top answers

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
13126 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
3723 Views

How do you calculate ratios? Example question: 'White paint costs £2.80 per litre, Blue paint costs £3.50 per litre, White paint and blue paint are mixed in the ratio 3:2. Work out the cost of 18 litres of the mixture [4 marks]' AQA Mathematics (8300)

Firstly, we need to calculate how much of the mixed paint is going to be white paint and how much is going to be blue paint. We can do this by looking at the ratio 3:2, if we add up the numbers in the ratio ...
ZA
Answered by Zoe A. • Maths tutor
17529 Views

p^2 x p^2

p^7
TS
Answered by Tom S. • Maths tutor
4308 Views

What is standard form?

Standard form is a convenient way to represent very large or very small numbers. By converting number to standard form, it becomes easier to do simple functions like multiplication or division. A logaritmic ...
MH
Answered by Morgan H. • Maths tutor
8071 Views