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What's the best way to work out any percentage of a given number, e.g. 63% of 450?

The best way to approach this is to begin by working out what 1% of 450 would be: 450 is 100% of 450 So to work out what 1% of 450 is: 450 ÷ 100 = 4.5 Now we know that 1% of 450 is 4.5To work out 63% of 450,...
IW
Answered by Isobel W. • Maths tutor
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What are the first 4 non-zero terms in the binomial expansion of (2+3x)^6

Well in a binomial expansion we need to remember the formula (1+x)^n = 1 + nx + (n(n-1)(x^2))/2! + (n(n-1)(n-2)x^3)/3! + ... (I can draw this out properly on the whiteboard app)There is another formula but t...
KG
Answered by Kester G. • Maths tutor
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Simplify √(4x^8).

√(4x 8 ) = √4 x √(x 8 ) = 2 x (x 8 ) 1/2 = 2x 4 Remember that (x n ) p = x np .
DS
Answered by Della S. • Maths tutor
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Describe two ways in which the process of cell division shown differs between plant cells and animal cells.

In animal cells there will be centriolesIn animal cell there will be no cell plate formation/ there will be constriction of the cytoplasm
Answered by • Biology tutor
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Differentiate f(x) = (3x + 5)(4x - 7)

A good way to approach this question is to first expand the brackets . This gives 12x 2 - 21x + 20x - 35 (remember to take the negative seven into account). We can then simplify this to give 12x 2 - x - 35 ....
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Answered by Akanksha D. • Maths tutor
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