Conditional: If a triangle is scalene, then the triangle has no congruent sides. Which statement shows the conditional written as a true biconditional?

Ineed with number 6 , explain how to get 1978

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

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.