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What are Descartes' three waves of doubt and his response to it?

Descartes went through three increasingly strong arguments in an attempt to bring doubt to every single thing that he knew. The first is the argument from illusion, in which he suggests that his senses may d...
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Answered by Adam B. • Philosophy tutor
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What are moles in Chemistry?

The moles is the amount of a substance that we are measuring, its like measuring how many coins I have in my pocket, but instead how many atoms of an element we have. We use the equation moles=mass/RMM to wo...
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Answered by Lucy P. • Chemistry tutor
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Write 36% as a fraction in its simplest terms.

36%= 36/100 Divide it by 2, the answer will be 18/50. It can then be divide by 2 again and getting to the answer of 9/25.
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Answered by Li Ying O. • Maths tutor
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Find the value of X and Y if X^2 + Y^2 = 13 and 2X + Y = 1

Firstly, since only one equation is linear, substitution must be used. This will allow us to make a quadratic equation with one variable and solve for X and Y. To do this, I will make Y the subject of the fo...
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Answered by Alexis S. • Maths tutor
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Should I use the imperfect or perfect tense in this sentence?

The perfect tense refers to a completed event in the past where the effect of the event may still continue in the present. Whereas, the imperfect tense describes ongoing past events without reference to a ti...
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