In a certain chemical, the ratio of zinc to copper 4 is 17 to. A jar of the chemical contains 646 of copper. How many grams of zinc does it contain? It contains
nothing grams of zinc

PL HEL

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

If value of cos330° is √3/2 then find tan165°.

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?