So whats this "age" people refer to when saying someone's underage if its different in every country. Sorry just got mole sted and wanted to ask =)

The chs baseball team was on the field and the batter popped the ball up. the equation b(t)=80t-16•16+3.5 represents the height of the ball above the ground in feet as a function of time in seconds. how long will the catcher have to get in position to catch the ball before it hits the ground? round to the nearest second

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

The high temp today was 62°. when nighttime comes, the temp will drop 40°. by 4am the temp will drop an additional 40°. what is the temp at 4am?