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

Factor 50x^3-90x^2 3x+6y=9
4x+5y=15
x-y+4=0
5x+15+5y=10x
2x+2y-4=x+5

Examples that my teacher gave me to help me out, but i still don't understand. so can you please hel