In ΔBCD, the measure of ∠D=90°, BD = 63, CB = 65, and DC = 16. What ratio represents the cosine of ∠B?

The length of a rectangle is 40 cm longer than it’s width. the perimeter of its rectangle is 120 cm. find it’s width and length

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At a grocery store the manager randomly selects 20 cartons of eggs, he finds 3 cartons with at least 1 broken egg. if the refrigerator holds 500 cartons, how many would you expect to have at least 1 broken egg? a shipment to a warehouse consists of 3700 dvd players. the manager chooses random sample of 50 dvd players and finds 3 are defective. how many dvd players are likely to be defective?