The table shows the change in the amount(in gallons) of gasoline in a car over a period of five days. What is the total change in the amount of gasoline in the car over the five day period. Write your answer as a decimal

Explanation:

The changes with negative sign mean that the gasoline is being consumed, the changes with positive sign mean that gasoline was added to the tank.

The total or net change may be found by adding all the neative changes (consumptions), adding all the positive changes (purchases) and then subtracting the lower from the higher: if the consumptions were larger than the purchases the final sign will be negative, if, on the contray, the purchases were larger than the consumptions, the sign will be positive:

1. Consumptions:

Add all the negative changes: 1.05 + 1.20 + 0.85 + 2.15 = 5.25

2. Purchases:

Add all the positive changes: 10.50

3. Which is larger?

The total of the positive values is larger than the total of the negative values, thus the total change will be positive:

Here we want to study the table to see the total change in the amount of gasoline over the five-day period.

We will see that the amount of gasoline increased by 5.25 gallons over that five-day period.

Now we need to study the given graph:

Notice that each day we have the change of that particular day, then we just need to add all of these changes and we will get the total change.

Where the negative numbers mean that the gasoline was used, and the positive numbers represent a charge in the gasoline (so it increases).

C = -1.05 - 1.20 - 0.85 + 10.50 - 2.15 = 5.25

This means that, in total, the amount of gasoline increased by 5.25 gallons over that five-day period.

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