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When is the subjunctive mood used in French?

At A-level, students will be expected to be able to confidently use the subjunctive mood. With a student, I would first discuss with them what the already know about the subjunctive, or any phrases they alre...
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Answered by Laura S. • French tutor
2316 Views

Prove that ∑(1/(r^2 -1)) from r=2 to r=n is equal to (3n^2-n-2)/(4n(n+1)) for all natural numbers n>=2.

To prove the above statement we will be using proof by induction as this is the easiest way to prove that the statement holds for all natural numbers n>=2. Firstly, when proving by induction there are thr...
SP
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There are 10 boys and 20 girls in a class. The mean mark in a test for all the class is 60. The mean mark for the girls is 54. Work out the mean mark for the boys.

First let us consider how we calculate the mean test mark in the first place, we add up the individual test marks of the entire class to give the total test mark then we divide by the number of students. Thi...
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Answered by Adam D. • Maths tutor
67926 Views

Give a definition/explanation for the term 'phenotype'

A phenotype is the expression of the genetic constitution of an organism and how it interacts with the environment.
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Answered by Frankie S. • Biology tutor
3136 Views

Which of these nucleotide bases is NOT present in RNA: Cytosine, Thymine, Guanine, Adenine, Uracil

The correct answer is: Thymine.The four bases found in DNA molecules are Cytosine, Guanine, Adenine and Thymine but in RNA molecules, the Thymine base is replaced by Uracil.
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Answered by Frankie S. • Biology tutor
25078 Views