book Maths Puzzle Numerical Ability

I need help with understanding the word twice in these problem. Thank you.

two more than twice a number

three less than twice a number

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book Other Question

Problem: (((negative 2 times "X" raised to the negative 5th power times "Y" raised to the 4th power times "Z" raised to the 2nd power))) negative 4.

I can figure out the solutio find center and radius of this circle

x^2+y^2+6x-4y+5=0