One delivery driver can complete a route in 7 h another can do the same route in 11 hours. what equation can the drivers use to determine time t in hours needed to complete the route when they work together?

What is the solution to the equation below? 3/x-2+6=square root x-2 +8

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

There are a total of 75 students in the robotics club and science club. the science club has 9 more students than the robotics club. how many students are in the science club?