Asked by sadie

1)The equation y=−4.9x2+8.82x+1.96 represents the height of the trajectory of a ball x seconds after it was released. The solutions to 0=−4.9x2+8.82x+1.96 are x=−0.2 and x=2. Which of these solutions represents the time it takes the ball to hit the ground?(1 point)
a) both x=−0.2 and x=2

b) x=−0.2

c) x=2

d) Neither of the solutions represents the correct time.

2) The equation y=−4.9x^2+19.5x+1.75 represents the height of the trajectory of a ball x seconds after it was released. At what time is the ball 10 meters above the ground?(1 point)

a) The ball never is never 10 meters above the ground.

b) approximately 0.5 seconds and 3.5 seconds

c) approximately 3.5 seconds

d) approximately 0.5 seconds

Answered by oobleck
(A) x = -0.2 is before the ball was thrown, so what do you think?
(B) You want to solve
−4.9x^2+19.5x+1.75 = 10
4.9x^2 - 19.5x + 8.25 = 0
Now just solve using the quadratic formula.
Answered by sadie
so it sounds like for number one its (a)
and for number 2 its (b)
Answered by oobleck
#1 is definitely NOT (a)
#2 is b
Answered by sadie
then then #1 would be b
Answered by oobleck
how could #1 be B if A is wrong? (And I told you why A is wrong ...)
Do a little thinking here!
Answered by sadie
omg im stupid its d) im so sorry for you having to deal with me
Answered by oobleck
*sigh* it's c)
They told you there are two solutions, but x = -0.2 makes no sense, so it must be x = 2
Answered by ketchup is better then musttard
If your seeing this your a legend stay safe :)
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