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There are 200 students in Year 10 110 are boys. There are 250 students in Year 11 140 are boys. Which year has the greater proportion of boys? (Taken from Nov 2014 AQA Unit 2)

To work this out we need to calculate the percentage of boys in year 10 and year 11. Then we can compare them to find which year has the greater proportion of boys.For Year 10 there are 110 boys out of 200 s...
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Answered by David S. • Maths tutor
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What is the subjunctive and when should it be used?

The subjunctive is a mood (not tense) used fairly commonly in Spanish. It can be formed in the present and past tenses (the present form of subjunctive is used when talking about the future also). At GCSE le...
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Answered by Kieran N. • Spanish tutor
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a) You area told that y is proportional to x2 and that when y = 75, x = 5. Find a formula for y in terms of x. y = x b) Find the value of y when x = 3. c) Find the value of x when y = 1200.

a) y is proportional to x^2, when x is 5, y is 75 Therefore: 75 = (something multiplied by) 5^2 75 = 3 x 25 Hence y = 3x^2 b) y = 3 multiplied by 3^2 = 27 c) 1200 = 3x^2 1200/3 = x^2 400 = x^2 Undo the squar...
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Answered by Kezia M. • Maths tutor
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Describe the changes at the cell membrane of a neuron during an action potential.

At rest the membrane potential is -70mV . This is due to the Na + /K + pump, which actively transports 3 Na + ions out of the cell for every 2 K + ions in. Therefore there is a net negative charge inside the...
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Answered by Alex N. • Biology tutor
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What is the mass of an object travelling at 15 m/s with a kinetic energy of 100 J?

Kinetic Energy (E k ) = 1/2(mv 2 ).This can be rearranged such that, m = (2E k )/v 2 we know from the question that E k = 100 J and we know that v = 15 m/sso plugging in the numbers, we get m = (2 x 100)/(15...
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