i) Round 7.789 to 1 decimal place.
ii) Round 0.0595 to 2 significant figures.
i) In 7.789, the cut-off digit (the 1st decimal place) is the second 7. The digit after this is an 8, meaning we round the 7, and get the answer: 7.8.
ii) In 0.0595, the cut-off digit (the 2nd significant figure) is the 9. The digit after this is a 5, meaning that we round the 9 up to 0, and add an extra 1 to the digit before the 9. Doing so, we get the answer: 0.060. (If you just got 0.06, this would only be 1 significant figure.)