A ball is thrown upward from the surface of Mars with an initial velocity of 50 feet per second. The height of the ball can be modeled by h(t)= -6.5t^2+50t (must show work)

a)What is the maximum height the ball reaches?

b) How long does it take the ball to fall back to the surface of Mars?

c) How long is the ball above 50 feet?

45

step-by-step explanation:

4 packs of water and 7 packs of candy bars

step-by-step explanation:

35x4=140

140/20=7

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.