André e Bruno foram a uma lanchonete e compraram lanches e sorvetes iguais. Bruno comprou 2 lanches e 1 sorvete e pagou R$21,00. Já André comprou 3 lanches e 2 sorvetes, pagando R$33,00. Qual era o preço, em reais, de cada lanche que André e Bruno compraram nessa lanchonete? R$5,00. R$9,00. R$10,50. R$10,70.

An astronaut drops a rock into a crater on the moon. the distance, d(t), in meters, the rock travels after t seconds can be modeled by the function d(t)0.82. what is the average speed, in meters per second, of the rock between 5 and 10 seconds after it was dropped?

Acollege is planning to construct a rectangular parking lot on land bordered on one side by a highway. the plan is to use 680 feet of fencing to fence off the other three sides. what dimensions should the lot have if the enclosed area is to be a maximum?

Dexter read 11 science fiction books and 5 history books. lena read 9 science fiction books and 4 history books. compare the students’ ratios of science fiction books to history books. 1. determine the ratios’ form:    science fiction books to history books 2. write the ratios as fractions:    dexter: 115; lena: 94 3. rewrite with a common denominator. 4. compare. 5. answer the question. determine which shows the correct comparison of the ratios for this problem.