Construct a derivation that shows the following argument to be valid. you may use any of our derivation rules (including the derived rules most recently covered).
(t& m)≡(~qv~r)
t& m
f⊃r

q⊃~f

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.