If \(2\sin^{2} \theta = 1 + \cos \theta, 0° \leq \theta \leq 90°\), find the value of \(\theta\).
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2015
Simplify: \(^{n}C_{r} ÷ ^{n}C_{r-1}\)
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2015
In calculating the mean of 8 numbers, a boy mistakenly used 17 instead of 25 as one of the numbers. If he obtained 20 as the mean, find the correct mean.
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2015
Four fair coins are tossed once. Calculate the probability of having equal heads and tails.
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2015
Given that \(y = 4 - 9x\) and \(\Delta x = 0.1\), calculate \(\Delta y\).
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2015
A particle starts from rest and moves in a straight line such that its acceleration after t secs is given by \(a = (3t - 2) ms^{-2}\). Find the distance covered after 3 secs.
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2015
A particle starts from rest and moves in a straight line such that its acceleration after t seconds is given by \(a = (3t - 2) ms^{-2}\). Find the other time when the velocity would be zero.
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2015
Find the coordinates of the point which divides the line joining P(-2, 3) and Q(4, 6) internally in the ratio 2 : 3.
If \(\begin{vmatrix}Â 1+2x & -1 \\ 6 & 3-x \end{vmatrix} = -3 \), find the values of x.
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2015
Each of the 90 students in a class speak at least Igbo or Hausa. If 56 students speak Igbo and 50 speak Hausa, find the probability that a student selected at random from the class speaks Igbo only.
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2015
A mass of 75kg is placed on a lift. Find the force exerted by the floor of the lift on the mass when the lift is moving up with constant velocity. \([g = 9.8ms^{-2}]\)
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2015
Marks012345Number of candidates6481093The table above shows the distribution of marks scored by students in a test. Find the interquartile range of the distribution.
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2015
Marks012345Number of candidates6481093The table above shows the distribution of marks scored by students in a test. How many candidates scored above the median score?
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2015
Given that \(r = 2i - j\), \(s = 3i + 5j\) and \(t = 6i - 2j\), find the magnitude of \(2r + s - t\).
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2015
Given the statements:p : the subject is difficultq : I will do my bestWhich of the following is equivalent to 'Although the subject is difficult, I will do my best'?
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2015
Given that \(x^{2} + 4x + k = (x + r)^{2} + 1\), find the value of k and r.
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2015
If \(\alpha\) and \(\beta\) are the roots of \(x^{2} + x - 2 = 0\), find the value of \(\frac{1}{\alpha^{2}} + \frac{1}{\beta^{2}}\).
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2015
The gradient of a curve at the point (-2, 0) is \(3x^{2} - 4x\). Find the equation of the curve.
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2015
If \(x = i - 3j\) and \(y = 6i + j\), calculate the angle between x and y.