19. The balloon hits the ground means -16t2+25t+3=0
After you solve the equation, there are 2 solution ~1.67 or ~-0.11 (the time can not be negative) so the solution is 1.67s
20.substitute t=1 to the function -16(1)2+25(1)+3=-16+25+3=12 ft. So the height is 12ft when t=1
Answer:
-73 sorry if im wrong
Step-by-step explanation:
find nth term but replace n with 50 equation is -2n+27
If you solve d = rt for t, you have t = d/r. If we have values for d and r we will fill them into that equation and divide.

. Setting that up so the meters cancel as they should looks like this:

lets us divide as we need to and at the same time cancel out the distance, leaving us time in hours. The t value then is 11.3 hours.