exam Maths Puzzle Numerical Ability

HELP PLEASE!!
What is the rule for the nth term :

d = -12 and a(subscript 1) = 80

Thanks very much

llo

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exam Other Question

Find the length of each side of the polygon for the given perimeter. P= 48 cm How to graph the solution set on a number line with these promblms?
1.)y > -4 when y is an integers.
2.)- 2 < j < 5 whenjis an integer.
3.)1.6 greater than or equal to k > 1.1