The answer to a) is... 10n -7
Try it! The fifth number is 43... so n=5
Based on my answer (n x 10)-7... and n=5... (5 x 10) - 7... 50 - 7 = 43... so this is correct!
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The answer to b) is 7n +1
E.g. 8 is the first number so n = 1
(1 x 7) + 1 = 7 + 1 = 8
15 is the second number so n = 2
(2 x 7) + 1 = 14 + 1 = 15
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The answer to c) is 4n - 14
E.g. -10 is the first number so n = 1
(4 x 1) -14 = 4 - 14 = -10
-6 is the second number so n = 2
(4 x 2) -14 = 8 - 14 = -6