Given that 3 x − 8 y = 39 Find y when x = 3

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year the population of her town is changing by a constant rate

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

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?