Kellis and David go for a 10-mile run. They start their run at the same time, but they run at different constant speeds. After 1 hour, David was 1 mile behind Kellis. David finished the run in 2.5 hours. At what speed was Kellis running, and how much earlier did she finish the run than David?

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

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

Drag the tiles to the correct boxes to complete the pairs. label each function. as even , odd, or neither.