In the morning a tank cntained 10 litres of water. At lunch time it contained 7 litres of water. What percentage of water was used fom the tanks

exa:

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3+11

14

step-by-step explanation:

from this example, we can see that subtracting with integers is the same as adding the opposite. we can solve using a number line or by using the saying "keep, change, change" to us solve. it is important to remember that we can subtract a negative and end up with a larger number than we started with.

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to complete this square you have to rotate about the origin 270 degrees clockwise.