Maths with David

    30 March

    πŸ‘‰πŸΌΞΎ = { 2, 3, 4, 5, 7, 9 },. A = { 2, 3, 4, 5, 7}, B = {2, 3, 5, 9 }. A number, x, is picked at random from ΞΎ. Find P(x πœ€ A∩B’)

    πŸ‘ˆπŸΌw is inversely proportional to y. x is directly proportional to the cube root of y. When y = 6.5 w = 8 and when w = 27, x = 100. Find the value of x when y = 0.8125

    πŸ‘†πŸΌ3x = 4y and \frac{y}{z} = \frac{2}{3} . Find x : y : z

    πŸ‘‡πŸΌMake y the subject of \frac{8}{x} = \frac{3}{y} + \frac{2}{5}

    πŸ–πŸΌw = \frac{\sqrt{c}}{x-1}

    c = 9.5 rounded to 1 decimal place and x = 4.81 rounded to 2 decimal places. Calculate the lower bound of w.