There are 12 members on a debating team. In how many ways can a team of four debaters be selected for competition if the captain of the team must be one of the speakers and the order of the speakers is to be a factor.

step-by-step explanation: h: (- 3, 6)

m: (1, - 2)

o: (7, 6)

r: (- 9, - 2)

midpoint of hm: (- 1, 2)

midpoint of or: (- 1, 2)

therefore, b is the midpoint of both diagonals bisect each other !

to prove the diagonals are perpendicular, show that the product of the slopes = - 1

13664

step-by-step explanation:

=cross multiply

=100 x = 13664

beth buys 10 x shirts and still has more than 100 in her account

3xy cannot be combined with the others

2x, -5x and x are like terms