exam Maths Puzzle Numerical Ability

Last question. Thanks!

Solve for x:

6 log3 x - 5 = 12

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exam Other Question

needed help!
determine whether the function {(13,0), (10,-9), (9,-10)} is invertible. If it is, then fin the inverse.

thank you so much im not understanding how to get the answer for (square root of 5) to the second power - (5 square root of 10) to the second power the answer is 49 but i dont know how they got it..