A package is dropped from a helicopter from a height of 3,136 ft. If the equation for height as a function of time is
h(t) = -16t2 + initial height where t is time
in seconds and h(t) is height in feet, how many seconds will it take for the package
to hit the ground?

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

Jeffery conducted a survey in his school and found that 30 of the 50 eighth grade students' favorite subject is mathematics. based on the results, jeffery concluded that out of the 200 students in his school, 120 students' favorite subject is mathematics. select the statement that is true about jeffery's conclusion. a. jeffery's conclusion is not valid because the sample was biased since only 200 students were surveyed. b. jeffery's conclusion is valid because the sample was random since all of the students were eighth grade students. c. jeffery's conclusion is valid because the sample was random. d. jeffery's conclusion is not valid because the sample was biased since all of the students were eighth grade students.

The ratio of men to women working for a company is 4 to 5 . if there are 90 women working for the company, what is the total number of employees?