I need help with this equation: 7y = 84y

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?

What is the scale factor of axyz to auvw?

What is the length of side s of the square shown below?