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answer
x =21.24
Step-by-step explanation:
180 (n-2)
7 sides
180 * 5 = 900
add up all the sides and = them to 900
25x + 369 = 900
25x = 531
x = 21.24 = answer
The objective is to get the variable (x) alone. To do this start be subtracting 3. What you do to one side you have to do to the other so you have to subtract three from the other side of the equal sign as well. So now you have:
20x= 17-3 subtract the 3 to get 20x=14
Now because the 20 is attached to the x In order to get the x alone you have to divide by 20:
20x/20. =14/20 divide 14 by 20
X=.7 or x=7/10