exam Maths Puzzle Numerical Ability

I need some help solving this problem. Can someone help me?

u^2+5u+7u+35

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exam Other Question

Marla begins waling at 3 mi/h toward the library. Her friend meets her at the halfway point and drives her the rest of the way. The distance to the library is 4 mi. How many hours did marla walk? numberline |x|<3