Cho một chùm chìa khoá có 5 chìa trong đó có 2 chìa mở được người ta thử ngẫu nhiên từng chìa cho đến khi mở được nếu không mở được thì bỏ ra. Gọi x là số lần thử hãy lập bảng phân phối xác suất của x

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

Martha has a deck of cards. she has lost some of the cards, and now the deck only contains nine spades, eleven diamonds, eight clubs, and twelve hearts. martha predicts that whenever she draws a card from the deck without looking, she will draw a club one-fifth of the time. which activity would best allow martha to test her prediction? a. randomly draw a card from the box and see if it is a club. b. randomly draw a card. then, continue to draw another card until all eight clubs are drawn. c. randomly draw and replace a card 120 times. then, observe how close to 30 times a club is drawn. d. randomly draw and replace a card 100 times. then, observe how close to 20 times a club is drawn.

How many solutions does the nonlinear system of equations graphed below have? a. one b. zero c. four d. two