Corentin a trouvé au grenier un sablier. Ce sablier a une hauteur totale de 10 cm et est constitué de deux cônes de révolution identiques. Le diamètre de chaque base est 5 cm. Au départ, la hauteur de sable est de 3 cm dans le cône du haut. Le sable s'écoule régulièrement à raison de 2,3 cm3 par minute. Corentin se demande si ce sablier pourrait lui servir à cuire des œufs à la coque. Aide-le à répondre à cette question. Explique bien tout ce que tu fais

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Apsychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. she randomly selects 100 students from the 260 business majors and 100 students from the 180 political science majors. does this sampling plan result in a simple random sample? why or why not? no, because each group of 200 students in the sample does not have the same chance of being selected. yes, because each group of 200 students in the sample has the same chance of being selected. no, because each individual student does not have an equal chance of being selected. yes, because each individual student has the same chance of being selected.

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?