A bag contains 7 red and 4 black identical balls. Two balls were picked at random from the bag and replaced each time. Find the probability the two balls were of same colour.
U varies directly as the square root of V when U = 24, V = 9, find the value of V when U = 16.
If B varies inversely as c\(^{\frac{1}{3}}\) and C = 27 when B = 2, find the value of the constant of proportionality K.
Find the roots of x\(^3\) - 19x - 30=0
If x is inversely proportional to y and x = 9 when y = 4, find the law containing x and y
