exam Maths Puzzle Numerical Ability

5*3^x=5

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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 give the first four terms of the geometric sequance in which a1=6 and r=4.
thanks i hope you can help!