19 June

Simplify \frac{x^2 - 1}{x^2 + x}

A number has been rounded to 10, correct to 1 significant figure.
Dasha says that the lower bound is 9.5 and the upper bound is 10.5.
Explain why Dasha is wrong.

Expand and simplify (4 − x)3

Find the equation of the straight line through (0, 5) which is perpendicular to the line y = 9x − 4

Rearrange y = \frac{7(x-w)}{w} to make w the subject.

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