A ball is rolling along the xx-axis. Its position (in feet) at time xx (in seconds) is given by f(x)=2x−−√f(x)=2x. Find its instantaneous rate of change when x=9x=9 seconds.

it's both, now can you answer my most recent question?

the rocket cannot penetrate the ground, in a contextual sense, therefore the roots of this equation should be the domain of this function. i'll let you find the roots of this quadratic equation (hint: use the quadratic formula:  

1- c

2-a

step-by-step explanation:

mark brainliest!