What are the domain and range of the real-valued function f(x)=2x? Select one: a. The domain is all real numbers except 0. The range is all real numbers except 0. b. The domain and the range are all real numbers. c. The domain is x>0. The range is f(x)>0. d. The domain is all real numbers except 0. The range is all real numbers.

The monthly texting plan of all star cell is $11 per month and $0.25 per text. the monthly texting plan of top line cell is $14 per month and $0.15 per text. a student wants to set up a system of equations to find the number of texts for which the total monthly cost of the two companies is the same. he uses the variables x and y. he lets y represent the total monthly cost. what will x represent? x = number of texts x = cost of the total number of texts x = total monthly cost x = cost of each text