A rocket is shot straight up from a 30-foot
rooftop with an initial velocity of 128 feet
per second. The height, h, of the rocket is
given by the equation h = -16t^2+ 128t+ 30,
where t is the time elapsed in seconds and h
is the height in feet.
a. How long will it take the rocket to
return to the ground?
b. The maximum height that the rocket
achieves is 286 feet. At what time does
it reach that height?

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.

For what value of x does 4x = (1/8) x + 5?

How to solve a simultaneous equation involved with fractions?