Paige is learning her multiplication facts. during instruction her teacher reinforces an average of every third correct response. paige is on a schedule of reinforcement. a. fi3 b. fr3 c. vi3 d. vr3

The persian wars started when emperor darius i began an invasion of greece. what caused darius to decide to attack greece? a. greek pirates had raided persia's merchant ships and coastal towns. b. greek armies had attacked and taken over land that belonged to persia. c. greek city-states had supported rebellions in the persian empire. d. greek leaders had declared independence from the persian empire.