a member of a book club wishes to purcahse two books from a selection of eight books recommended for a certain month. in how many ways can she choose them?

Anyone know? is appreciated! will mark brainliest if correct!

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

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 ?