The mean concentration of lead found in trout in a
river in Oregon is about 0.9 mg per kilogram of trout.
Express this concentration in ppb (parts per billion).

Adecorative window is made up of a rectangle with semicircles at either end. the ratio of ad to ab is 3: 2 and ab is 30 inches. what is the ratio of the area of the rectangle to the combined area of the semicircles? possible answers: a. 2: 3 b. 3: 2 c. 6: π d. 9: π e. 30: π