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A las 19:45 horas colisionan una moto y un auto Rápidez, distancia, tiempo

Sábado 28 de julio de 2012, por claudio

Un auto con una rápidez de 120 Km/h y una moto con una rápidez de 80 Km/h, que previamente y en el mismo instante pasan por A en dirección B y por B en dirección A, respectivamente. A las 19:45 colisionan. Las ciudades A Y B se encuentran a 600 Km.

¿A qué hora pasó el móvil por B?

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Mensajes

  • Investigations was on the recommended list on the state riveew, just not at the very top. It scored well in riveews. It has been used with success by many schools. It has never been meant to be used as the one and only math curriculum in any classroom. Any teacher who is using investigations alone is failing their students. I taught with this program in Seattle Public Schools and we also used Saxon math as a supplement. Saxon math was too rudimentary to enable the students to fully comprehend mathematical thinking and concepts. But it did help them to memorize and use the standard algorithms. Now, I am not teaching but my child is in first grade in Bellingham schools and I am as pleased as punch in her math learning. She is learning so much about how numbers relate to life and mathematical problem solving and thinking. Her teachers use mainly Investigations but they also supplement with other products. They are excellent teachers. They are happy with Investigations, and for good reason. It is an excellent product. Children need to be able to be fluent in math and there are many ways of teaching it. In my experience, this means using a variety of math products. But there is no reason Investigations cannot be the main curriculum product used in Bellingham schools. Bhammer and his blog have been on a negative rant about Investigations for more than a year. I have never understood why he does not put his time and energy into his classroom at Happy Valley elementary, learning more ways to successfully implement and supplement Investigations, rather than spending his time writing all this negativeness about it. But thank you, Tia, for pointing out the truth.

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