What is the 9th term in the sequence -1, 4, -9, 16, -25,...?

-81

Step-by-step explanation:

looks like they're doing perfect squares inversed..

so it'd go from -1,4,-9,16,-25,36,-49,64,-81

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:

step-by-step explanation:

the answer is 128