A binary operation \(\Delta\) is defined on the set of real numbers, R, by \(a \Delta b = \frac{a+b}{\sqrt{ab}}\), where a\(\neq\) 0, b\(\neq\) 0. Evaluate \(-3 \Delta -1\).
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799 questionsIf \(log_{y}\frac{1}{8}\) = 3, find the value of y.
A ball falls from a height of 18m above the ground. Find the speed with which the ball hits the ground. \([g = 10ms^{-2}]\)
A man of mass 80kg stands in a lift. If the lift moves upwards with acceleration 0.5\(ms^{-2}\), calculate the reaction from the floor of the lift on the man. \([g = 10ms^{-2}]\)
A force 10N acts in the direction 060° and another force 6N acts in the direction 330°. Find the y component of their resultant force.
A body of mass 10kg moving with a velocity of 5\(ms^{-1}\) collides with another body of mass 15kg moving in the same direction as the first with a velocity of 2\(ms^{-1}\). After collision, the two bodies move together with a common velocity v\(ms^{-1}\).
Find the unit vector in the direction of \(-2i + 5j\).
Given that \(r = 3i + 4j\) and \(t = -5i + 12j\), find the acute angle between them.
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.
A fair coin is tossed 3 times. Find the probability of obtaining exactly 2 heads.
Find the variance of 11, 12, 13, 14 and 15.
Given that \(n = 10\) and \(\sum d^{2} = 20\), calculate the Spearman's rank correlation coefficient.
Find an expression for y given that \(\frac{\mathrm d y}{\mathrm d x} = x^{2}\sqrt{x}\)
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. \([\pi = \frac{22}{7}]\)
Find the minimum value of \(y = 3x^{2} - x - 6\).
Find the gradient to the normal of the curve \(y = x^{3} - x^{2}\) at the point where x = 2.
Find \(\lim\limits_{x \to 3} \frac{2x^{2} + x - 21}{x - 3}\).
The lines \(2y + 3x - 16 = 0\) and \(7y - 2x - 6 = 0\) intersect at point P. Find the coordinates of P.
Points E(-2, -1) and F(3, 2) are the ends of the diameter of a circle. Find the equation of the circle.
Find the equation of the line which passes through (-4, 3) and parallel to line y = 2x + 5.