Answer:
Step-by-step explanation:
A do-decagon is a polygon with 12 straight sides and 12 equal angles.
-The general formula for finding area of a do-decagon is given as:
where s is the sides length.
-Given the sides dimension is 9cm, the area is calculated as;
Hence, the do-decagon's area is
The answer is B
The formula of the function is
f(X) = - (X+1)^2
The missing number is 12. The sequence goes 7, 12, 17. If you subtract five from each number, you get the one before it.
If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up (+1).
If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down (no change).