(a) A radioactive substance has a half-life of 20 years. If 8 mg of the substance remains afte 100 years, find (i) how much of the substance was initially present. (ii) after how many years only 2 mg will remain.

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Matrices

‘Matrices’ is the plural form of the word matrix, and it is basically a spreadsheet in the form of a box. In mathematics, various functions can be carried out with matrices. Generally, a matrix comes in the shape of a square or rectangle. The elements are distributed horizontally in the form of rows, and vertically in the form of columns.