Astatistics teacher wants to break his class of 28 students into four groups of seven

in how many ways can he do so?

suppose each group needs a leader and a recorder. assume all leaders and recorders are chosen first. how many ways are there now?

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?

Afootball is throw by a quarterback to a receiver

Asales representative from a local radio station is trying to convince the owner of a small fitness club to advertise on her station. the representative says that if the owner begins advertising on the station today, the club's total number of members will grow exponentially each month. she uses the given expression to model the number of club members, in hundreds, after advertising for t months.