(PLEASE HELP MEE) A Jetliner uses 3,600 gallons of fuel per hour while it is cruising, and there are 15,000 gallons of fuel in the jetliner's fuel tank when It begins to crulse. If yrepresents the amount of fuel, In thousands of gallons, remaining in the fuel tank after the Jetliner cruises for x hours, determine the graph of the solution set for this situation and the equation modeled by the graph.
((Graph options in picture))​

Saline iv fluid bags cost $64.20 for 24, 1000 ml bags from one supplier. a new supplier sells 500 ml bags for $2 each. the hospital uses about 10,000, 1000 ml bags each month. nurses report that about half of the bags are more than half full when they are discarded. if you are going to use only one supplier, which size bag provides the best deal, and how much will you save each month? compare the cost of the new supplier to the current one.

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?