Trigonomos spotted a tree across the river and marked the spot directly across from it. Then he walked to

another point 10 meters down the river and found that the angle between his side of the river and the line

connecting him to the tree was 40°.

Im literally having a mental breakdown

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

Tom drove 206 miles in 3.9 hours. estimate his average speed.