Basically when the object hits the ground, f(t) is equal zero. So all you need to do is to solve the quadratic equation:
-5t^2 + 20t + 60 = 0
D = b^2 - 4ac = 20^2 - 4 × (-5) × 60 = 400 + 1200 = 1600
t1 = (-b + sqrt(D)) / 2a = (-20 + 40) / (-10) = -2
t2 = (-b - sqrt(D)) / 2a = (-20 - 40) / (-10) = 6
Since time can't be negative, our solution is t2.
So the object will hit the ground in 6 seconds.
Answer: 12
Step-by-step explanation:
Answer:
-1
Step-by-step explanation 4 - 3x= 2x+9
take x in a side and the numbers in the other side then 4-9=2x+3x................-5=5x.....x=-1
Answer:
4s+4
Step-by-step explanation:
I hoped this helped :)
Answer:
A:rational hope this helps mark brainlest
Step-by-step explanation:
