exam Maths Puzzle Numerical Ability

Solve: 6^(n+1)>=10. Round to four decimals.

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exam Other Question

ok so i have a factoring polynomials test and im so confued!! the problem is
9b^2-20 i know that its prime but i dont know why its prime! please help!! A triangle has sides 3x+7, 4x-9 and 5x+6. Find the polynomial that represents its perimter. HELP!