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How do I determine when to use the subjunctive?

When dealing with the subjunctive, there are two acronyms which, if committed to memory, will help you massively with learning in which situations the subjunctive needs to or needn't be used. When it is NOT ...
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Answered by Jakob H. • Spanish tutor
6653 Views

A circle with centre C has equation x^2 + y^2 + 2x + 6y - 40 = 0 . Express this equation in the form (x - a)^2 + (x - b)^2 = r^2. Find the co-ordinates of C and the radius of the circle.

We can express the equation of any circle in the form (x - a)^2 + (y- b)^2 = r^2 . The centre of the circle is then the point (a, b) and its radius is r . If we multiply out the brackets in the equation abov...
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Answered by Baran K. • Maths tutor
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The line AB has equation 3x + 5y = 7. What is the gradient of AB?

The gradient of a line in the form y = ax + b, where a and b are some numbers, is the number a . So we need to get the equation 3x + 5y = 7 into the above form, with y on one side on its own! We first move t...
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Answered by Baran K. • Maths tutor
8783 Views

When should I use the perfect and imperfect tenses when talking about past actions?

For this question we will use the verb manger (to eat) as an example. The perfect tense is used to describe an action which took place once in the past. You can think of it as a single, completed action . EX...
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Answered by Laura G. • French tutor
4159 Views

What does a velocity-time graph represent?

The first step in answering any question is to figure out what the question really means! Velocity is a term physicists use to describe not just speed, but speed in a particular direction. When we talk about...
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Answered by Iman S. • Physics tutor
21779 Views