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Factorise fully x^2+6x+5=0

To start, notice that we have x^2 in our equation. This means that our answer is of the form (x )(x ). We now look for integers that give 5 when multiplied together. The only way we can do this is with the n...
JI
Answered by Jonny I. • Maths tutor
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Explain how bacteria may become resistant to antibiotics

Bacterial resistance to antibiotics is an example of natural selection. In a population of bacteria there may be some individuals that are not affected by the antibiotic. This may be due to random changes or...
RG
Answered by Rowena G. • Biology tutor
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Explain how crude oil is separated into fractions (6 marks)

Crude oil is separated into fractions in a process called fraction distillation. The crude oil mixture is separated in a distillation column. The column is hot at the bottom and cool at the top. Fractional d...
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Answered by Rowena G. • Chemistry tutor
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There are 10 balls in a bag. The balls are the same apart from their colour. Of the 10 balls, 3 are black, 5 white, 2 red. What is the probability of picking a white ball from the bag.

To calculate the probability assume it is equally likely to choose any of the 10 balls. This is reasonable as we are told that the balls are the same apart from their colours. If we label each ball by number...
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Answered by Alvin S. • Maths tutor
8525 Views

Why were rallies in Nazi Germany important?

During the Nazis' years in power between 1933 and 1945, Joseph Goebbels was given the very important task of making sure that the Nazi message was effectively spread, through the use of propaganda. One of Go...
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Answered by Francesca W. • History tutor
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