The exponential function that describes the graph is
The standard form of an exponential function is expressed as
a is the y-intercept
(x, y) is the point on the graph
Given the following expression
a = 7
(x, y) = (4, 112)
Substitute the given values into the exponential equation
Get the required exponential equation
Recall that , hence the required equation will be
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Answer:
1)
2) After 8 minutes delivering fuel the tanks will have 121 gallons of fuel
Step-by-step explanation:
1) For generating the equation we have to take into account that in the tanks there is a initial volume of fuel that corresponds to 75 gallons, as it is stated that tank one is half full. As the capacity for tank 1 is of 150 gallons, half of the tank equals to:
Now we have to convert the rate of delivery that is expressed as a mixed number to an improper fraction so:
Then the pumping rate is of 23/4 gallons per minute, to get how many gallons are in the tank we just need to multiply this rate by the time in minutes, and as there is an initial volume we have to add it, so we have the following equation:
2) To know how much fuel is in the tank after 8 minutes we have to replace this time in the previous equation so we have
After 8 minutes delivering fuel the tanks will have 121 gallons of fuel