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

39
Prove the property
a11 a12 a13 b11 a12 a13 (a11 + b11) a12 a13
a21 a22 a23 + b21 a22 a23 = (a21 + b21) a22 a23
a31 a32 a33 b31 a32 a33 (a32 + b31) a32 a33
I need The product of a number and a second number that is 3 more than 5 times the first is 2. Identify the numbers.