Asmall rock falling from the top of a 124-ft-tall building with an initial downward velocity of -30ft/sec is modeled by the equation h(t)= -16t2-30t+124, where t is the time in seconds. for which interval of time does the rock remain in the air?

Step-by-step explanation:

A small rock falling from the top of a 124-ft-tall building with an initial downward velocity of -30 ft/sec is modeled by the equation .

Equation :

Now we are supposed to find For which interval of time does the rock remain in the air

Substitute h(t)=0

Since time cannot be negative .So, neglect

So, time interval for which  the rock remain in the air:

i dont know sorry

step-by-step explanation: