A square OABC with the length of a side 6cm and circle O with a radius 5cm are given. Which of the lines
OA
,
AB
,
BC
, or
AC
are secants to the circle O?

Evaluate the following expression 1/3^2

It says factor each expression 49x-28?

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.