D Hobbs Schools Key School has 337 students. Park School has 387 students. About how many students attend these schools?
Use compatible numbers to estimate.
Enter the correct numbers in the boxes to complete the compatible numbers and the estimate.
Estimate using compatible numbers:
+ 375 =
There are about
How many students?

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