In mathematics grade 10, one topic that is covered is sequences. A sequence is an ordered list of items, usually numbers, where each item is called a "term". There are different types of sequences, including arithmetic, geometric, and harmonic sequences. An arithmetic sequence is a sequence where every term after the first is obtained by adding a constant called the common difference. In an arithmetic sequence, the nth term can be found using the formula a_n = a_1 + (n-1)d, where a_1 is the first term and d is the common difference. In addition to arithmetic sequences, other topics related to sequences that may be covered in grade 10 math include finding patterns and series.