Atextbook store sold a combined total of 480 history and math textbooks in a week. the number of history textbooks sold was two times the number of math textbooks sold. how many textbooks of each type were sold?

let h = history books, and m = math books

h + m = 480

h = 2m

plug in 2m for h

2m + m = 480

3m = 480

m = 480/3

m = 160

Plug in 160 for m in one of the equations

h + m = 480

h + 160 = 480

h = 480 - 160

h = 320

h = 320, m = 160

hope this helps

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:

circumference divided by 3.141592654 then timesthe radius twice