Find the sum of the following APs: (i) 2, 7, 12, ..., to 10 terms. (ii) -37, -33, -29, ..., to 12 terms. (iii) 0.6, 1.7, 2.8, ..., to 100 terms. (iv) \frac{1}{15}, \frac{1}{12}, \frac{1}{10}, ..., to 11 terms.