The ratio of the number of text messages sent by Robert to the number of text messages sent by his sister, Jenny, is 3 to 5. Together they sent a total of 48 text messages.

The cost to rent a moving truck is a flat fee of $25 plus $0.60 per mile. the equation c = 25 + 0.6m models the cost, c, in dollars for the number of miles, m, traveled in the truck. identify the independent and dependent variables. the is the independent variable. the is the dependent variable.