exam Maths Puzzle Numerical Ability

This one number is giving me lots of problems... PLEASE HELP!!

Students in a fifth-grade class were given an exam. During the next 2 years, the same students were retested seve

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5b=b+b+b+b Can you please help me with these two problems 1. square root 15x to the 6th power *12x to the 4th power
and
2. x =square x+13+7 Thank you for your help