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There is a total of 7! possible ways in which the seven children can be seated on the bench. The number of favourable arrangements when four boys are seated on one side and three girls on the other side i...

Firstly, take a look at the essay title and go through with a highlighter, picking out any key words you think you will need to address when writing the essay. For example, say the question was: 'The size...

Moles of CuCO3 (using triangle) = 5.00/123.5 = 0.0450 mol.1 mol of CuCO3 makes 1 mol of CO2, therefore 0.0450 mol of CuCO3 makes 0.0450 mol of CO2.Using the triangle, mass of CO2 = 44 x 0.0450 = 1.78 gram...

1 ) Identify the information given in the question:Total number of cupcakes bought: 125Number bought by Emma is 50% more than Robin: mathematically we write that was Emma = 1.5 Robin as 50% = 0.5 in decim...

Apply FOIL (First, outside, inside, last): (x + 4)(x - 5) = x² - 5x + 4x -20 = x² - x -20 x(x + 4)(x - 5) = x( x² - x -20 ) = x³ - x²- 20x