(Solved): a delicatessen makes a roast-beef on sourdough sandwich for which you can choose from nine condiment ...

a delicatessen makes a roast-beef on sourdough sandwich for which you can choose from nine condiments.  a) how many different types of roast-beef on sourdough sandwiches can the delicatessen prepare?  b) what is the minimum number of condiments the delicatessen must have available if it wishes to offers at least 2,000 different types of roadt beef on sourdougb sandwiches?