Given that \(r = 3i + 4j\) and \(t = -5i + 12j\), find the acute angle between them.
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2016
A box contains 14 white balls and 6 black balls. Find the probability of first drawing a black ball and then a white ball without replacement.
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2016
A fair coin is tossed 3 times. Find the probability of obtaining exactly 2 heads.
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2016
Find the variance of 11, 12, 13, 14 and 15.
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2016
Given that \(n = 10\) and \(\sum d^{2} = 20\), calculate the Spearman's rank correlation coefficient.
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2016
Find an expression for y given that \(\frac{\mathrm d y}{\mathrm d x} = x^{2}\sqrt{x}\)
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2016
The radius of a circle increases at a rate of 0.5\(cms^{-1}\). Find the rate of change in the area of the circle with radius 7cm. \([\pi = \frac{22}{7}]\)
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2016
Find the minimum value of \(y = 3x^{2} - x - 6\).
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2016
Find the gradient to the normal of the curve \(y = x^{3} - x^{2}\) at the point where x = 2.