What is the difference between a rotation and a reflection?

What expression is equivalent to 42x-56y

How many grams the dog will eat in 3 days?

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?