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What is the best way to label a scale to graph each of the following situations on the number line in visual . Also, graph an integer to represent both situations. A. A hiker is 𝟏𝟓 feet above sea level. 𝟏𝟓 B. A diver is 𝟐𝟎 feet below sea level.

When the water level changes, the altimeter measures sea level.

Source: www.alamy.com

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Source: https://www.slideshare.net/Melanie_Anderson/introduction-to-positive-and-negative-numbers

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Vertical number lines are used in measuring sea level to resemble the height of the water or amount of fluid in a cup.
Source: https://lh4.googleusercontent.com/3nSjPVbZut4EYZjlwjj58Q3cjuFK-fF1B4KPNbyJXj7-jsLfVMosUaB9pGFT6yzqdA67nVpzLAGWh_figu3a1cbhAIgbWQnuHA=w1280-h609

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This picture shows how sea level is measured vertically.
Source : www.alamy.com

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The level of the water is different on different pieces of land.
Source: mashupmath.com

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I used -30 as my minimum and 30 as my maximum so that both integers(15 & -20) can be graphed in this number line. I counted by 5's because both integers are multiples of 5 and easy to read on the graph.

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I counted up by 10's for the scale to get up to 15 feet above sea level (point A= 15) and down to 20 feet below sea level (point B= -20).

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I started at -20 and counted up to 15 so that both integers in the situation can fit on the graph.

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On my scale, I counted by 5's because both of the numbers can fall on a readable point and not in the middle of the tick marks.

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Counting by 10 was the best way to scale this graph because counting by smaller numbers would require a bigger graph with a whole bunch of tick marks that we are not interested in. In the picture below I graphed 15 feet above sea level and 20 feet below sea level.
Source: https://www.google.com/imgresimgurl=https%3A%2F%2Fimage.slidesharecdn.com%2Finterestingintegers100925124303phpapp02%2F95%2Finteresting-integers-9-728.jpg%3Fcb%3D1285510252&imgrefurl=https%3A%2F%2Fwww.slideshare.net%2Fmathteacher13%2Finteresting-integers-5285605&docid=xYca4zl60p01gM&tbnid=ggUcKuOjEZJtHM%3A&vet=10ahUKEwjvqa_SsqffAhUmm-AKHS79Ac0QMwg-KAEwAQ..i&w=728&h=546&safe=strict&bih=609&biw=1280&q=using%20negative%20numbers%20to%20measure%20sea%20level&ved=0ahUKEwjvqa_SsqffAhUmm-AKHS79Ac0QMwg-KAEwAQ&iact=mrc&uact=8

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Every tick mark is 5. I think this is the easiest since both of the integers im looking for are multiples of 5.