exam Maths Puzzle Numerical Ability

Identify the rate of change (slope) and the Y-intercept. X^2+10X+250

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exam Other Question

Evaluate
|-x-2y| x= -2 y= 3

I say the answer is 4 but my daughter says -4.
Which one is right???

Thanks for your expertise!!!! simplify7to2nd=8to3rd-8to2nd