The cost of gasoline is directly proportional to the number of gallons of gasoline purchased. Ms. Butcher paid $25.20 for 12 gallons of gas. If c represents the cost in dollars and g represents the gallons of gas purchased, which equation best represents this relationship? (a) c= 0.48g
(b) c= 2.1g
(c) c=25.20g
(d) c=302.4g

Each of the walls of a room with square dimensions has been built with two pieces of sheetrock, a smaller one and a larger one. the length of all the smaller ones is the same and is stored in the variable small. similarly, the length of all the larger ones is the same and is stored in the variable large. write a single expression whose value is the total area of this room. do not use any method invocations.

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

Which of the following is the explicit rule for a geometric sequence defined a recursive formula of a -5a for which the first term is 23?