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What are the differences between decimal points and significant figures?

The total number of digits to the right of the point are known as ' decimal points ' whereas significant figures start from the first non-zero number. Note : As significant figures start from the first non-z...
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Answered by Niall L. • Maths tutor
84350 Views

How do I find the length of a side of a triangle using the cosine rule?

Suppose we have a triangle with 2 sides of length 4 and 5 (in any units), and the angle between those sides is 60 degrees. We want to find the length of the side opposite the 60 degree angle. Write the cosin...
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Answered by Angus H. • Maths tutor
5799 Views

How do you substitute a number into an algebraic expression?

To substitute a number into an algebraic expression, all you need to do is re-write the expression in exactly the same way, except replacing the variable (letter) with the number. It always makes it clearer ...
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Answered by Bethany H. • Maths tutor
47585 Views

Find the derivative of x^x

y = x^x -- Yikes! Doesn't that look ugly. It's mostly the x^x part, since ... to the x is fine, and x to the ... is fine. We must split the two x's in order to continue. Perhaps we could log? since then we c...
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Answered by Mayur D. • Maths tutor
5689 Views

How can I know whether to multiply or add probabilities?

We can only add probabilities when the events are alternatives . For example, let's say we want to calculate the probability that we achieve an A or a B or a C in a given exam. We cannot achieve an A and B f...
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Answered by Nathan O. • Maths tutor
83270 Views