4. Suppose that a positive integer is written in decimal notation as n = akak–1 … a2a1a0 where 0 ai 9. Prove that n is divisible by 11 if and only if the alternating sum of its digits a0 – ai + … + (–1) kak is divisible by 11.

Describe how fraction strips can you order fractions

Last year, a state university received 3,560 applications from boys. of those applications, 35 percent were from boys who lived in other states. part a)how many applications did the university receive from boys who lived in other states? part b)applications to the university from boys represented 40percent of all applications. how many applications did the university receive in all? i don't how to do part b so me and plz tell how you got your answer

Cal's go cart has a gas tank with the dimensions shown below. he uses a gas can that holds 11 gallon of gas, to fill the go cart tank. 11 gallon = 231 inches^3 how many full gas cans will it take to fill the go cart's gas tank?