a chair can be ordered in dark, light or oak finish with a choice of tan, black or cream seat cover and in regular or tall height. how many different chairs can be ordered?​

Two farmers pay a total rent of $140 for a pasture. the first farmer placed $4 oxen in the pasture, and the second farmer placed $30 sheep in the pasture. the farmers split the rent based on the proportion of the pasture eaten by their own animals that month. how much should the first farmer pay, if 1 ox eats as much as 10 sheep in a month?

Lines a and b are perpendicular. if the slope of line a is 3, what is the slope of line b?

Savannah talked for 6 minutes on the phone. catherine talked for n minutes. catherine talked 3 times as long as savannah. how long did nathan talk?