To make a special energy drink Jerome uses 8 cups of water and 3 cups of drink mix what is the ratio of drink mix to water

Will give brainliest sum of arithmetic series (sigma notation) find the numerical answer to the summation given below. (image shown below)

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Pepe and leo deposits money into their savings account at the end of the month the table shows the account balances. if there pattern of savings continue and neither earns interest nor withdraw any of the money , how will the balance compare after a very long time ?