Lenora bought a book for $12.36 and some school
supplies for $7.29 and $5.47. how much did she
spend?

Through non-collinear points there is exactly one plane.

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.

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.