Multiple questions here that I need help with, with the first two I can paste the graphs. please help

1.At 12 pm, the runner has reached the 42 kilometer mark. Five hours later, the runner reaches the 60 kilometer mark. The following graph shows the distance y (in kilometers) covered by the runner x hours after 12 pm.

Find the equation of the line in the form y equals a x plus b and enter values for a and b.

2.Later that day, Kevin interviews the manager of the citys oil storage facility. The city currently has 200,000 barrels in oil reserves, and the manager believes it will run out of reserves in 8 months. A chart is shown below.

If the city increases its reserves by 25,000 barrels, and the same rate of consumption is assumed, how many months will it then take until it runs out of reserves?

3.The school board also discusses how to invest some of its reserves. They want to invest 3 million dollars in a mixture of 2 types of bond funds: a corporate bond fund paying 3% interest per year, and a municipal bond fund paying 6% interest per year.

How much money should be invested in the corporate bond fund if the total annual return between both investments is $120,000?

4.On his way home from the school board meeting, Kevin fills up his car. He likes the idea of using gasoline with ethanol, but thinks his car can only handle 60% ethanol. At the gas station, he can use regular gas with 10% ethanol or E85 fuel with 85% ethanol.

How many gallons of regular fuel should Kevin use if he wants to fill up his car with 15 gallons of fuel containing 60% ethanol?