9. the water level is 3 feet below your dock. the tide goes out, and the water level lowers 1 foot. a storm surge comes in, and the water level rises 2 feet. write an integer to indicate the new water level

We know that that the water level is 3 feet below your deck. (-3)
When the tide goes out, the water level lowers 1 foot. (-1)
A storm surge comes in, the water level rises 2 feet. (+2)

New water level: -3-1+2= -4+2= -2
The new water level is 2 feet below the dock.

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Technically speaking, histograms are another version of bar charts, if you need to work one out then skim through google hope-o that -o!

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