ECO 22.01

A)  Ninguna          B)  Una                C)  Dos

D)  Tres                E)  Cuatro

• A)  Ninguna

• B)  Una

• C)  Dos

• D)  Tres

• E)  Cuatro

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Señale el periodo mínimo:

y = 3sen4x

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READING 1

 In the United States, years ago, only one case of skin cancer was detected for every fifteen hundred inhabitants. Before, healthy people, with tanned skin and the most elegant, boasted about their adventures in spas and beaches. All this changed. Instead of lying on the beach, it is advisable to find a shady place, where the sun's rays reach indirectly. In addition, it is advisable to use protective creams, as suggested by the United States Cancer Institute.

1.    The central idea of ​​the text is:

• A) The rate of skin cancer in the United States.

• B) Skin cancer prevention in North America.

• C) Skin cancer; a statistical study.

• D) The harmful nature of sunny days.

• E) Cancer and its proliferation in North America.

READING 2

 Plato was very interested in mathematics, because mathematical relationships never change. The sum of the angles of a triangle is always 180°. Therefore, it is something about which we must have certain knowledge. Plato maintained that we can only have vague ideas about what we feel, but we can obtain certain knowledge about what we recognize with reason.

2. The best summary of the text is:

• A) Human beings should be concerned about seeking certain knowledge.

• B) Plato maintained that mathematics is based on invariable relationships.

• C) Mathematics cannot be made up of imprecise concepts.

• D) Plato's rationalism led him to highlight the importance of mathematics.

• E) Knowledge of mathematics allows our reason to overcome vagueness.