Depending on breed, management and environment, the domestic horse (including draft horses) today has a life expectancy of 25 to 35 years. It is uncommon, but a few animals live into their 40s and, occasionally, beyond. The oldest verifiable record was Old Billy, a 19th-century horse that lived to the age of 62.
TRUE. Validity is a necessary condition for being sound. 14. FALSE. A valid argument can have a true conclusion and false premises (see #11); and if an argument does not have all true premises, then it is not sound.
It is quite simple to determine the mood and figure of a standard form categorical syllogism. Don't make it difficult. Once you have determined the mood and figure you can look at the first chart on p. 256 (unconditionally valid) to determine whether the argument is valid or not. If the argument form is in the chart, the argument is valid. If it is not in the chart, and if you can certify that the required terms of the syllogism exist, then check the second chart. If it is on this chart, the argument is valid.