Symbolize these arguments and display truth trees to evaluate the resulting argument

forms for validity. If the argument form is invalid, describe (in English) the conditions under which
the premises would be true but the conclusion false.

99.32 There will be scorpions in the house this week if there is any building going on in the neighborhood.
There will be building only if the depression in the housing market ends. If there are
scorpions in the house, the cats will kill them and bring them to me as trophies. Therefore, if the
housing depression ends, my cats will bring me scorpions as trophies.

99.33 My cat won’t sing opera unless the lights are out. If I am very insistent, then my cat will
sing opera; and if I either turn all the lights out or howl at the moon, you can be sure that I am very
insistent. I howl at the moon if I am not very insistent. Therefore, my lights are out, my cat is singing
opera, and I am very insistent.
Instructions:

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