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A radio sells for £63, after a 40% increase in the cost price. Find the cost price.

X+2/5X = 63 or 63 = 140% First we need to understand that the original price (X) has been increased by 40%. Hence, by 2/5 (40/100 = 40%) of its original value, in other words, 2/5X. To find the answer we the...
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Answered by Gianluca B. • Maths tutor
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Fully simplify the expression: 4 / (sqrt(8) + 4)

Notice that the square root of 8 can be simplified: 4 / (sqrt(4) * sqrt(2) + 4) = 4 / (2 * sqrt(2) + 4) Divide top and bottom of the fraction by two: 2 / (sqrt(2) + 2) Rationalise the denominator: (2 / (sqrt...
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Answered by Oliver M. • Maths tutor
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Do you have any examples to explain consecutio temporum?

Well, consecutio temporum probably is one of the thoughest concepts to deal with for italian foreign learners. As the world says, consecutio temporum means "time consequence". With this we mean tha...
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Answered by Ginevra M. • Italian tutor
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What is equilibrium in regards to chemical reactions?

A + B -----> AB In the chemical reaction above, reactant A reacts with reactant B to form product AB. However, it is a common misconception that this reaction only goes in the forward direction (which is ...
BH
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What are enzymes and what factors are they affected by?

Enzymes are proteins that catalyze nearly all reactions that go on in your body that would otherwise be too slow for survival. The substances or molecules that enzymes catalyze are called substrates , and th...
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Answered by Beatrice H. • Biology tutor
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