a plain is flying at 14,690 well a submarine is submerge at 521 ft below the surface of the ocean what is the difference ​

Step-by-step explanation:

The term ‘elevation’ normally means the measurement above a defined point. Universally we use the 'mean sea level’ as the point of reference for measuring heights. So the airplane is considered to be at the height of 14,690 ft above the mean sea level and the submarine is at 521 ft below the mean sea level.

In case you're wondering what the height of the submarine would be in mean sea level in terms of elevation, it would just be the negative of the given depth. So, the elevation of the submarine can also be expessed as -521 ft mean sea level.

I hope i could clear your query.

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8.75

how-to:

first, we need to find what we have to work with.

since i know that we have 7 (years) and 0.8 (inches), we can use these to solve and find the equation!

secondly, what you want to do, is see that we need to know how much growth out of the 0.8 inches he got in only 1 year, instead of 7 years.

let's try to divide.

7 ÷ 0.8 = 8.75