83 Найдите произведение: \( \begin{array}{l}\text { а) } \frac{4}{9} \cdot \frac{9}{7} \cdot \frac{7}{17} \cdot \frac{17}{28} ;\end{array} \)

An airplane flew from Nassau to Chicag o, a distance of 1300 miles at an average speed of 520 mph Calculate the time taken

1.Calcule a média aritmética das seguintes notas de um estudante: 7, 8, 9, 6 e 10. -406

12\$ Hsin A cooler contains bottles of orange juice, apple juice and grapefruit juice in the ratio of \( 3: 4: 3 \) a There are 960 of orange juice in the couler (a) Calculate the number of bottles of apple juice that are in the cooler

Lake Michigan bevat \( 1.3 \times 10^{15} \) US gallons water. Hoeveel \( \mathrm{dm}^{3} \) is dat?

5.Um aluno obteve as seguintes notas em três provas, com pesos diferentes: Prova 1:7 (peso 2) Prova 2:8 (peso 3) Prova 3:6 (peso 5) Calcule a média das notas desse aluno?