exam Maths Puzzle Numerical Ability

Its asking to write the next term in sequence and then write a rule for the nth term. 1,10,100,1000,.... What would the nth term be?

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I am having problems with this one

x^2+7x-1=0
If I was given the points ( -2, -4) (1,-1) would my answer be y=1x+2?
And if I was given the points (2,4) and (-3,-1) would my answer be y=1x-2?

Thank you for your help!