exam Maths Puzzle Numerical Ability

Determine whether sqrt(-) is rational or irrational

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exam Other Question

I need some help with this question- I missed the unit lesson and I am having trouble getting the answer.

Given that in an arithmetic sequence t3=-2 and t7=-5, what is the formula for the nth term tn? what is the value of t11

Thanks so much Solve for x:

(3)/(x) - (1)/(x + 2) = (-2)/(3x + 6)