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1i) solve x^2-4x-21=0

Factorise to get (x+3)(x-7)=0 So you can see that x = -3 or x =7
KI
Answered by Kishwar I. • Maths tutor
4294 Views

Describe the difference between the function of a receptor and the function of an effector. Give examples.

When seeing this sort of question, I would handle it by explaining what both a receptor and an effector is firstly and giving examples. Secondly, I would explicitly state the difference to make sure the answ...
AM
Answered by Ashni M. • Biology tutor
27929 Views

Why can endothermic reactions occur spontaneously if the entropy change is negative for a cooling process?

An endothermic process is one which cools as the reaction proceeds meaning that the entropy change of the reaction will be negative. These reactions may still be feasible as the spontaneous nature of a react...
ER
Answered by Eve R. • Chemistry tutor
18468 Views

How do I structure an essay exam question?

When I answer essay questions, I always try and stick to a 'rule of three'. This means that the body of the essay (everything between the introduction and the conclusion, where you actually make your case) i...
CS
4804 Views

Outline the structure of a protein

Primary structure : Amino acids (AAs), the building blocks for all proteins, are linked together by peptide bonds . The primary sequence tells you the AAs in the protein but not the 3D shape. Secondary struc...
SD
Answered by Sinead D. • Biology tutor
3077 Views