Coffee shops that reward customers with one free cup of coffee after every ten coffee purchases are using a reinforcement schedule. a. fixed-intervalb. variable-intervalc. fixed-ratiod. variable-ratio

C.

Fixed-ratio

Explanation:

This is a process of delivering a reward for every particular number of purchase or patronage made by clients or customers. This is usually done by business owners.

in 342 bc j._c. egypt fell into the hands of the persians, under the reign of nectanebo ii

greek city-states unite in a revolt against the persian empire at the beginning of the fifth century bc. j.-c  

from the year 660 or 659 bc ad, cyrus preached the revolt against the medes to deliver the persians.