Question

The quadratic function d = –3x^2 + 16 models a skateboarder’s distance, in feet, from the bottom of a hill x seconds after the skateboarder starts moving down the hill. After how many seconds is the skateboarder 8 ft from the bottom of the hill?

Answer 1

Answer:

To find the solution, plug in 8 for d

d=-3x2+16  

8=-3x2+16  Subtract 8 from both sides

0=-3x2+8

Now, use the quadratic equation to solve for x  

 

a=-3

b=0

c=8

x=1.63 or  

C. 1.6s

Step-by-step explanation:

Answer 2

The Answer is 1.6

Hope this helps