Airplane a takes off and ascends at a rate of 3000 ft/min. at the same time, airplane b, which is flying at 30,000 ft, begins to descend at a rate of 2500 ft/min. let h represent the height off the ground in feet, and let t represent time in minutes. which system models this situation?
a. h = 3000. h = 2500 + 30,000t
b. h = 30,000 + 3000t. h = 30,000 - 3000t
c. h = 2500t. h = 30,000 - 3000t
d. h = 3000t. h = 30,000 - 2500t

What is the vertex form of f(x) = x2 + 6x + 3

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?

It appears that people who are mildly obese are less active than leaner people. one study looked at the average number of minutes per day that people spend standing or walking. among mildly obese people, the mean number of minutes of daily activity (standing or walking) is approximately normally distributed with mean 376 minutes and standard deviation 64 minutes. the mean number of minutes of daily activity for lean people is approximately normally distributed with mean 528 minutes and standard deviation 107 minutes. a researcher records the minutes of activity for an srs of 7 mildly obese people and an srs of 7 lean people. use z-scores rounded to two decimal places to answer the following: what is the probability (image for it appears that people who are mildly obese are less active than leaner people. one study looked at the averag0.0001) that the mean number of minutes of daily activity of the 6 mildly obese people exceeds 420 minutes? what is the probability (image for it appears that people who are mildly obese are less active than leaner people. one study looked at the averag0.0001) that the mean number of minutes of daily activity of the 6 lean people exceeds 420 minutes?