exam Maths Puzzle Numerical Ability

Solve the equation:

x^-2 - 15x^-1 + 44 = 0

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exam Other Question

Find the rate 392 feet / 8 seconds

The 392 feet is on top of the 8 seconds
Here is the problem. PLEASE help if you can!

7^x-2/6=√7

√7= square root of 7