The height of a satellite above Earth over a certain period of time is described by the function shown. f(x)=2x2−16x+800 In this function, x = the time in hours and f(x) = the height in kilometers. What is the minimum height of the satellite during this period of time? A. 786 kilometers
B. 800 kilometers
C. 4 kilometers
D. 768 kilometers

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?

At the "no mutants allowed" country farm, every sheep has 4 legs, every chicken has two legs, and all animals have only 1 head. asked to count how many sheep and chicken are in the fields, a farm boy reports back that there are 140 feet and 50 heads. how many sheep and chicken are there? there are sheep and chicken at the farm.

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.