The temperature in Glasgow one day was k∘Ck^{\circ}\text{C}k∘C. The next day the temperature was 3∘C3^{\circ}\text{C}3∘C lower.
Work out the new temperature in terms of kkk.
370 exam-style questions on Eduqas GCSE Maths Negative Numbers. Each one has a worked solution and a mark scheme showing where the marks go.