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...write it more fully as '1 × 10-15', but the '1 ×' is redundant). In this case the power of ten is preceded by a minus sign, and it means that the number is 1 divided by 1 followed by 15 zeros (i.e. 1 divided by 1015, or 1/(1015), which is 0.000 000 000 000 001). That makes a very small number indeed. We can describe Mercury's atmospheric pressure as being 15 orders of...

...writing the ratio of prices in pounds sterling to prices in euros is two to three (2 : 3). What is the equivalent price in pounds for a coat costing 150 euros? Answer 3 euros are equivalent to 2 pounds. This means that So price in pounds = 2/3 × price in euros = 2/3 × 150 = 100 The equivalent price of the coat is £100...Ratio, proportion and percentages: 1.2.1 Try some...

...write the appropriate SQL DDL statements into a file that can be executed by a DBMS so that there is an independent record, a text file, of the SQL statements defining the database. Another method is to work interactively using a database tool like Sybase Central (or Microsoft Access), where the forms provided for defining tables help avoid the need to remember the...

...write down your answers to individual questions. Magic mushroom compound for the treatment of depression? Wighton, K. (2016) Magic mushroom compound tested for treatment-resistant depression, Imperial College London, Press Release. [Press Release] Cowen, P. (2016) ‘Altered states: psilocybin for treatment-resistant depression’, Lancet Psychiatry, vol. 3, no. 7, pp....