Zhang walks in a straight line from the trail head at (0,0). He travels at an average rate of mi/h in the direction 30degrees west of north. What are the coordinates of Changsha location, relative to the trail head, after 4hours?

Multiply −2x(6x^4−7x^2+x−5) express the answer in standard form. enter your answer in the box.

Which of the following represents the range of the graph of f(x) below

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters