book Maths Puzzle Numerical Ability

properties and definations of circle

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book Other Question

Find the dimensions of a rectangle whose area is 180 sq. cm and whose perimeter is 54 cm. Solve for x:
1) 3^x=729 I got 6
2) 6^x-28=-8 I got 10/3
3) 4ln 3x =15 I got 14.17

am I correct?