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What does it mean for an argument to be valid?

An argument is valid if and only if the following is impossible: all of the premises are true and the conclusion is false. E.g. the argument below is valid:(1) All men are mortal(2) Socrates is a man(3) So, ...
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Answered by Oliver H. • Philosophy tutor
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Kevser buys 5kg of sweets for £10. She separates the sweets so that there are 250g of sweets in each bag. She sells each bag for 65p. She sells all bags. What is her percentage profit?

1kg = 1000grams 5kg = 5000 grams. 5kg will give 20 bags (5000/250). Total amount she will make from selling is £13. Hence, profit percentage is (13-10)/10*100. Which gives profit percentage since profit is t...
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Answered by Kevser T. • Maths tutor
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The equation of a straight line is 3x + 2y = 24. Find where the line crosses the x-axis.

Let's first think about what it means when the line crosses the x-axis. If we consider a normal x-y coordinate plane, every point on the x-axis has a y value of 0. So if we are trying to find out where the l...
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Answered by Angela D. • Maths tutor
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Find the turning points of the curve (x^3)/3 + x^2 -8x + 5

Step one, we need to assess what the question is asking us to do, in this case, find the turning points.The turning points on the graph are where the gradient is equal to zero, so in order to find the turnin...
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Answered by Ellie M. • Maths tutor
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3-methyl pent 2 ene reacts with HBr to form two products. Which of these products is the minor and major product and why?

3-bromo 3 methyl pentane will be the major product while 1 bromo 3 methyl pentane will be the minor. This is due to a more stable carbocation being formed. A secondary carbocation is more stable than a primary.
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Answered by Alex N. • Chemistry tutor
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