7. Here is a list of numbers.

5, 8, 9, 11, 12, 13, 17, 18, 20

(a) Which numbers in the list are factors of 40?

17. 243, -81, 27, -9, ……., ........

What are the next two numbers in the sequence?

19. The heights, in metres, of eleven children are

1.32, 1.47, 1.43, 1.32, 1.35, 1.46, 1.49, 1.32, 1.37, 1.49, 1.48

a) What is the mode height?

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