exam Maths Puzzle Numerical Ability

write an algebraic expression for 6 more than twice m

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exam Other Question

The problem reads:

Solve by completing the square. Show all your work.

x^2=5x+2

Please show how to solve this problem. Thank you I am having a problem understanding regression lines. One of my study questions is "use the equation of the regression line to predict y when x=20"
I am given a multiple choice answers of: 45.5, 50, 40 or 48.5.

Can somebody explain this to me?