Posted by Jen on Wednesday, July 13, 2011 at 6:39pm.
correct! this is called the contrapositive.
p->q ≡ ~q->~p
I will leave it to you to prove the identity with truth tables.
Do it yourself.
a swimming pool is built as follow;
the top view is a rectangle 12ft by 30ft. the pool is 4 feet deep at the shallow end and 9 feet at the deep end. the sides walls are as shown. how many square ft of tile will it take to tile the two side walls and both end walls?
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