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Find the size of the temperature increase from 4 am to 4 pm, given that the temperature was -12^{\circ}C at 4 am and 21^{\circ}C at 4 pm.
Mathematics 0580 · IGCSE · The four operations
Find the size of the temperature increase from 4 am to 4 pm, given that the temperature was -12^{\circ}C at 4 am and 21^{\circ}C at 4 pm.