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How do I know whether to use the imperfect or the preterite tense?

The imperfect tense is used to describe actions that do not have a clear beginning and end. For example, actions that were repeated (‘I used to go to school’), or, what we could call ‘background information’...
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Answered by Julia S. • Spanish tutor
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Simplify fully (3x^2 -8x- 3)/(2x^2-6x)

When simplifying algebraic expressions, we should first factorise each term fully to find any common factors. First we should factorise the numerator where 3x 2 -8x-3 factorises to (3x+1)(x-3). Next, we shou...
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Answered by Paaras P. • Maths tutor
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Describe the structure of proteins (5)

The primary structure of proteins consist of the sequence of amino acids that are joined by peptide bonds. These amino acids are joined together via a condensation reaction. The secondary structure is formed...
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Answered by Saiful K. • Biology tutor
21829 Views

What are the differences between directional and stabilising selection? Give an example of each.

In directional (a.k.a. adaptive) selection, one extreme of a population has a selective advantage i.e. is fitter than other individuals of the population. This causes a directional shift towards this extreme...
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Answered by Ben S. • Biology tutor
5445 Views

A drone is hovering at a constant height above the ground. The mass of the drone is 7 kg. The mass of the package is 3 kg. Calculate the upward force of the Drone.

To answer this Question we will use the equation derived from Newtons second law of motion, F=ma or in this case W=mg as it is the mass of the object being accelerated by gracity, giving us it's weight The a...
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Answered by Finn T. • Physics tutor
4590 Views