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Firstly, you form the question into an equation. for example, J + T = 84. We know Jessica paid £38.50, so now we can add that to the equation. 38.50 + T = 84. Now that we have does this we move the 38.5 t...

(5 - x)/2 = 2x - 7, 5 - x = 2(2x - 7), 5 - x = 4x - 14, 5 + 14 = 4x + x, 19 = 5x, 19/5 = x

x=0.777...10x=7.77...9x=10x-x=7
9x=7so x=7/9so x=0.777...=7/9

This problem can be solved by using algebra and rearranging as follows:

Let x = 0.545454...
Then 100x = 54.545454...

If we then subtract x from 100x we g...

A derivative, in essence, is the gradient of a function at a point, usually denoted by dy/dx, or f'(x). It essentially means the rate of change of y with respect to x. As many functions are complex, we ca...