Eight children are divided into an a team and a b team each containing 4 children. how many different divisions are possible?

What signals you that factoring by grouping is the best method to use when factoring a problem?

Aball is dropped from a height of 10m above the ground. it bounce to 90% of its previous height on each bounce. what is the approximate height that the ball bounce to the fourth bounce?

In δabc, m∠acb = 90°, cd ⊥ ab and m∠acd = 45°. find: a find cd, if bc = 3 in