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When is the passé composé used and when do I use avoir or être?

The passé composé is used to describe completed or repeated actions that were done in the past. It is translated into English as either the past simple tense (e.g. I ate) or the present perfect tense (e.g. I...
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Answered by Serena V. • French tutor
3254 Views

Solve the simultaneous equations 6x - 27 = 15 and 4x + 3y = -3.

Initially we have two unknown variables, so we want to eliminate one of the variables (x) to solve for the other (y). The LCM of 6 and 4 is 12, so multiply each equation such that the coefficient of x is 12:...
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Answered by Alannah C. • Maths tutor
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Bromine has an atomic number of 35 but has two stable isotopes- bromine-79 and bromine-81. Given that 51% of bromine atoms are bromine-79 and 49% are bromine-81%, work out the relative atomic mass of bromine to the nearest whole number.

What is an isotope? (To ensure the students basic understanding on isotopes) Isotopes are different atomic forms of the same element, which have same number of protons but different number of neutrons. e.g 7...
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Answered by Mehek S. • Chemistry tutor
21768 Views

Can you explain the different ways heat can travel?

Heat can travel through 3 different processes: conduction, convection and radiation. Conduction is caused by atoms bumping into each other, transferring energy and therefore heat. An example of this would be...
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Answered by Jake G. • Physics tutor
3984 Views

Explain why 17th century Puritans were opposed to the theatre.

The conservative sect of Protestantism disliked theatres because they were seen as immoral places harbouring anti-Puritan ideas and groups. This immorality was manifested in criminal groups often found in th...
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Answered by Phoebe H. • History tutor
17870 Views