Assume That the Elevation E , in Feet, of a Sag

Multiple Choice

Assume that the elevation E , in feet, of a sag in a proposed route is given by $E ( x ) = 0.000039 x ^ { 2 } - 0.25 x + 1300$ where x represents the horizontal distance in feet along the proposed route and $$0 \leq x \leq 5000$$ . For what x-values is the elevation 1100 feet or more? Round your answer to the nearest foot.

A) $x < 947 f \mathrm { ft } \text { or } x > 5473 \mathrm { ft }$
B) $x < 937 f \mathrm { ft } \text { or } x > 5473 \mathrm { ft }$
C) $\mathrm { x } < 937 \mathrm { ft } \text { or } x > 5483 \mathrm { ft }$
D) $x < 947 \text { ft or } x > 5483 f t$