Draw place value disks on the place value chart to solve. Show each step using the standard algorithm

Evaluate 4 a for a = 5 2/3 . express your answer in simplest form.

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

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