(a) (i) For the finite arithmetic sequence 5, 8, 11,..., 44. write down the first term a, the difference d, and the last term L, and hence find the number of terms n of the sequence. Check that your answer is correct. (ii) Use an appropriate formula from Unit 9, Subsection 1.1 to find the sum of the arithmetic sequence in part (a)(i). (b) Expand the brackets in the following expressions. (i) (4x-8)(7x+9) (ii) (7a-5b)² (c) Factorise 36h²-49k2.

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