A continuación se realizan algunas ope-raciones de forma oral. Indica en cada caso las estrategias utilizadas y qué pro-piedades de las operaciones se están uti-lizando: a) 2.453 − 1.238, dos mil cuatrocientos cincuenta y tres menos mil doscien-tos, mil doscientos cincuenta y tres, menos treinta, mil doscientos veinti-trés, mil doscientos veinte menos cin-co, mil doscientos quince.

b) 197 + 322 + 38, trescientos treinta y treinta, trescientos sesenta, más dos-cientos, quinientos sesenta, menos tres, quinientos cincuenta y siete.

Aprofessional hockey team has noticed that, over the past several seasons, as the number of wins increases, the total number of hot dogs sold at the concession stands increases. the hockey team concludes that winning makes people crave hot dogs. what is wrong with the hockey team's conclusion? a) it does not take into account the attendance during each season. b) it does not take into account the number of hamburgers sold during each season. c) it does not take into account the number of concession stands in the hockey arena. d) it does not take into account the number of seasons the hockey team has been in existence.