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Solve the simultaneous equations 4x + 5y = 13 and 3x - 2y = 27.

Using the elimination method to remove the variable x, we need both equations to have the same values of x. To do this we find the lowest common multiple of the x values: the lowest common multiple of 3 and ...
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Answered by Christy H. • Maths tutor
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Outline the impact of temperature variation on weathering processes in hot deserts.

Mechanical weathering.Very high temperatures during the day determine the expansion of rocks. Contraction occurs during the night when temperatures are very low, sometimes bellow freezing point. Therefore, t...
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Answered by Elena P. • Geography tutor
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Describe the differences between the oceanic and continental crust.

The oceanic crust is generally younger than the continental crust as it is less than 200 million years old and can also be renewed or destroyed at plate boundaries. For example, the oceanic crust which forms...
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Answered by Emma P. • Geography tutor
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Explain one way in which hospital care was different in the 13th and 19th centuries?

During the 13th century most hospitals were run by the Church therefore they were very religious. Hospitals were typically staffed by monks and nuns, most illnesses were treated by worshipping God. Due to a ...
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Answered by Alexandra L. • History tutor
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How do you form the imperfect past tense and what is the difference between the preterite and the imperfect tense?

The imperfect past tense is formed with the endings:AR verbs Yo - abatú - abasel/ella - aba nosotros - abamos vosotros - abais ellos/ellas - aban ER and IR verbs yo - ía tú - ías el/ella - ía nosotros - íamo...
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Answered by Lucy C. • Maths tutor
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