15. Find the next two terms in each sequence, and also the formula for the nth term.
(a) 2, 5, 8, 11, .......
(b) 3, 6, 11, 18, 27
20. The following four cards are shuffled and placed face down. Jacob then selects two of the cards randomly.
(a) List all the possible pairs of cards.
(b) Write down the coordinates for points B and D.
27. Anne, Bilal and Colin share £3800 in the ratio 8 : 5 : 7. Work out how much each one receives.