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Kelly is trying to work out the two values of w for which 3w - w^3 = 2 Her values are 1 and -1 Are her values correct? You must show your working.

Firstly substitute her first value into the equation so w=1 giving (3 x 1) - (1)^3 = 3 - 1= 2 so her first value for w is correct Next substitute the second value into the equation so w= -1 giving (3 x -1) -...
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Answered by Eve N. • Maths tutor
11205 Views

GCSE: How do you find the bearing of point B from A?

Draw a line pointing North from point A. Use a ruler to draw a line that joins points A and B. Use a protractor to measure the angle between the line that is North of A and the line that joins A and B This a...
MP
Answered by Marcel P. • Maths tutor
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Work out 2 and 3/4 x 1 and 5/7 Give your answer as a mixed number in its simplest form.

First make each fraction into an improper fraction so on the top of the first fraction it would be 3 + (2 x 4) = 3 + 8 = 11 therefore first fraction = 11/4 for the second fraction the top = 5 + (1 x 7) = 5 +...
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Answered by Eve N. • Maths tutor
31082 Views

Differentiate y=4x^2+3x+9

Use the rule of "bringing down the power" and then reducing the power by 1. Start with 4x^2. "Bring down" the 2 to make (4)(2)x^2, then reduce the power by 1 to make 8x. Now repeat this w...
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Answered by Tarryn R. • Maths tutor
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What is the trend in atomic radius of the elements across Period 3 and why does this occur?

The atomic radius of the elements decreases from sodium to argon. This is because the number of protons increases (sodium has 11, argon has 18) so the nuclear charge increases. Therefore, the attraction betw...
CG
Answered by Chloe G. • Chemistry tutor
56065 Views