book Maths Puzzle Numerical Ability

how do you find the sixth term in the geometric sequence in which t1=4 and tn=2tn-1

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book Other Question

My equation was 3/4*1/3-2+3squared I came up with -3/24+9 and now i am stuck. Solve each compound inequality. State the solution set using interval notation and graph it

4. x <= 0 and x + 6 > 3