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 would say c is the best answer, hope it's right!

good luck! =)

cutie~

amount of oatypop that contains the prize = 40%

amount   of oatypop which doesn't contain the prize = (100-40)=60%

probability that hannah will win a prize

    = s +f s +f f s+ff   f s+ff f f s+ infinity.where f= failure,s= success

=   or 60%

probability that hannah only has to buy 3 or less boxes before getting a prize= (s) and ( f s) and (ff s) and (f f f s)

        = = 87.04 %  

step-by-step explanation: