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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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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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Expand and simplify the following expression: x(5x – 2) – 3(x2 – 2x + 7)

5x2 – 2x – 3x2 + 6x – 21= 2x2 + 4x − 21
Answered by • Maths tutor
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The longest side in a right-angled triangle is 12cm. One of the shorter sides is 4 cm. Calculate the perimeter of the triangle

12 2 = 4 2 + x 2 [This is pythagoras' theorem (a 2 = b 2 + c 2 ) ] 144 =16 + x 2 128 = x 2 11.31 = x Perimeter = 11.31 + 12 +4 = 27.31
RC
Answered by Rachel C. • Maths tutor
8199 Views

Make d the subject of the formula: 3d + dxy = 4

d (3 + xy) = 4 d = 4/(3 + xy)
Answered by • Maths tutor
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