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How does antibiotic resistance develop in bacterial populations?

When a course of antibiotics is taken, non-resistant bacteria should be killed. However, genetic mutations can lead to certain individuals becoming resistant to a particular antibiotic. The mutated gene that...
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Answered by Callum D. • Biology tutor
6996 Views

A cricketer throws a ball vertically upwards so that the ball leaves his hands at a speed of 25 m/s. Calculate the maximum height reached by the ball, the time taken to reach max. height, and the speed of the ball when it is at 50% max. height.

We can see that this is a suvat question, since it involves a projectile. The first step for any suvat question is to list the known suvat variables for the point we're looking at (in this case, the point of...
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Answered by Ellie S. • Physics tutor
22530 Views

How do I use "y" and "en" in sentences?

The concept of "y" and "en" can be difficult to grasp at first, as both words are often used quite idiomatically, and can be translated in a number of different ways. Y and en are adverbi...
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Answered by Callum D. • French tutor
32023 Views

Solve 3x^2 = 8x - 2 giving your answers to 2 d.p.

First things first, we have to decide what type of equation this is, so we can choose how to deal with it. If it were linear (which means every term involving an 'x' has no power/superscript on it. I.e. x 2 ...
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Answered by Annabel W. • Maths tutor
10450 Views

How do you solve a quadratic equation?

There are several different methods for solving quadratic equations. The method you use depends on the equation in question. Usually, the easiest method is by factorising the quadratic, so you want to check ...
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Answered by Thomas H. • Maths tutor
6984 Views