exam Maths Puzzle Numerical Ability

if T=a+(n-1)d find t when a=16 n=11 and d=6
find t when a=20 n=6 and d=-2

please help me im stuck!!!

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exam Other Question
which point on a number line best represtents the squar root of three when 35z^2-23z-72 is factored completely, one of the factors is: