exam Maths Puzzle Numerical Ability

A triangle has sides 3x+7, 4x-9 and 5x+6. Find the polynomial that represents its perimter. HELP!

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exam Other Question

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

Thanks find the interest rate for a simple interest loan with P=$1420, I=$306.72, t=3 years