The quadratic model f (x) = - 5x2 + 200 represents the approximate height, in meters, of a ball x seconds after being dropped. The ball is 50 meters from the ground after about how many seconds?

2.45

3.16

5.48

7.07

Question

Imogen

Mathematics

16 October, 20:47

The quadratic model f (x) = - 5x2 + 200 represents the approximate height, in meters, of a ball x seconds after being dropped. The ball is 50 meters from the ground after about how many seconds?

2.45

3.16

5.48

7.07

+1

Answers (1)

Know the Answer?

Desmond Hogan · Answer 1

The quadratic model f (x) = - 5x2 + 200 with x = seconds and f (x) = 50 meters

so

50 = - 5x2 + 200

5x^2 = 200-50

5x^2 = 150

x^2 = 150/50

x^2 = 30

x = 5.48

answer

C. third choice

5.48 seconds

The quadratic model f (x) = - 5x2 + 200 represents the approximate height, in meters, of a ball x seconds after being dropped. The ball is 50 meters from the ground after about how many seconds?2.453.165.487.07

The quadratic model f (x) = - 5x2 + 200 represents the approximate height, in meters, of a ball x seconds after being dropped. The ball is 50 meters from the ground after about how many seconds?

2.45

3.16

5.48

7.07