There are 8 teachers in a school, 4 males and 4 females. 4 teachers are chosen to join a committee. How many ways are there when 2 males and 2 females chosen?

2-digit numbers less than 91 which are 1 less than a multiple of 10

Divide the following fractions 3/4 ÷ 2/3 1/2 8/9 9/8 2

Bob is putting books on a shelf and takes a break after filling 18 1/2 inches on the book shelf. the book shelf is now 2/3 full. how long is the entire bookshelf?