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Why is the sky blue?

The Earth's atmosphere scatters incoming light from the sun. This incoming light is made up of lots of different colours. Each colour of light has a different wavelength and because of this, different colour...
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Answered by Hector S. • Physics tutor
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3 teas and 2 coffees have a total cost of £7.80 5 teas and 4 coffees have a total cost of £14.20 Work out the cost of one tea and the cost of one coffee.

We approach this question using algebra.Lets say the price of teas=x, and the price of coffees = ytherefore 2 equations can be written:3x+2y=7.805x+4y=14.20we now treat these equations as simultaneous equati...
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Answered by Abigail R. • Maths tutor
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Sketch the graph y=-x^3, using this sketch y=-x^(1/3)

The first step in figuring out this question is to first determine what the y=x 3 looks like.If you are not already fimilar with this function, you can use some basic principles to find out what it looks lik...
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Answered by Deloris O. • Maths tutor
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Find the value of 125^(2/3)

laws of indices state that the denominator of the fraction is the root of the number or letter, and the numerator of the fraction is the power to raise the answer to. Therefore, first we handle the 3 on the ...
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Answered by Abigail R. • Maths tutor
16226 Views

How to differentiate 9x^2+ 4x-7=0

To differentiate we multiply the power by the number infant of the x, and then reduce the power by 1. So the answer would be 18x+4=0
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Answered by Abigail R. • Maths tutor
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