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The formula of the altitude of an equilateral triangle with side x:

We have:

Substitute:
This is through multiplication and division.
Remember your order of operations!
Answer: 6.3
Good luck!
-RxL
Answer: 3 3/7
Step-by-step explanation:
6 - 2 4/7
6 is the same thing as 5 7/7
5 7/7 - 2 4/7 = 3 3/7
Umm I'm not that good at this but my guess is One triangle let me know if that was right