If a certain machine makes electrical resistors having a mean resistance of 60 ohms and a standard deviation of 4.5 ohms, what is the probability that a random sample of 81 of these resistors will have a combined resistance of more than 4949.1 ohms?

(hurry! ) which expression is equivalent to the following complex fraction?

Which sum or difference identity would you use to verify that cos (180° - ∅) = -cos ∅? a. sin (α -β) = sin α cos β – cos α sin β b. cos (α -β) = cos α cos β – sin α sin β c. cos (α -β) = cos α cos β + sin α sin β d. sin (α + β) = sin α cos β + cos α sin β

Asegment in the complex plane has a midpoint at 7 – 2i. if the segment has an endpoint at 11 – 3i, what is the other endpoint?