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How do I show two lines are skew?

Skew lines in 3 dimensions are those which are not parallel and do not intersect. Let's take two example lines: l 1 = (2, 2, -1) + λ(3, 1, -3) and l 2 = (1, 0, 1) + µ(6, -4, 9) First we need to show that the...
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Answered by David M. • Maths tutor
131520 Views

Could you run through the stages in the light-independent reaction (Calvin Cycle) of photosynthesis?

Okay, so here we have what seems like a very daunting ​ list of chemical reactions to remember that don't seem to make any sense! But don't worry ​, with practice you will soon grasp the concept quickly. ​ L...
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Answered by Shane C. • Biology tutor
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Describe the process of translation

Translation takes place on ribsomes, which can be found on the rough endoplasmic reticulum (ER) or within the cytoplasm. Once the mRNA has been exported from the nucleus it binds to a ribsome. The ribosome s...
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Answered by Amy M. • Biology tutor
9791 Views

Find the tangent of the following curve, y=xe^x, at x=1 expressing it in the form y=mx+c?

Firstly, we calculate the y-value when x=1, namely y=e. Then we need to find the gradient of this curve at x=1, which can be determined by taking the derivative of y and then valuate it at x=1. So dy/dx=xe^x...
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Answered by Bruno S. • Maths tutor
19071 Views

The government has introduced an ad valorem tax on petrol. The likely effect is: A) Increase in sales of petrol B) Increase in carbon emissions from electric cars C) Increase in demand for bus travel D) Decrease in sale of electric cars

Four mark questions are a great way to pick up marks. There is a simple strategy to remember when answering these. Firstly, always write down your definition of the key word(s). Even if you do not know the c...
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Answered by Binal P. • Economics tutor
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