Divide £50 into the ratio 1:4

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Find the volume of the solid whose base is the region bounded by f(x), g(x) and the x-axis on the interval [0, 1], and whose cross-sections perpendicular to the y-axis are squares. your work must show the integral, but you may use your calculator to evaluate it. give 3 decimal places for your answe

Grant simplified the expression 1.5(-3.2 + 2.5) his work is shown below explain the error in grants work