Answer:
Commutative property and associative properties are mixed up.
Step-by-step explanation:
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D. Pyramid
...........
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Answer:
14%
Step-by-step explanation:
1. The formula to find percent change is 
. Now, all we have to do is plug in the values to their corresponding variable.
2. (Solving)
- 14%
B = 3h . . . . . . . .given by the problem statement
A = (1/2)bh . . . . formula for the area of a triangle
486 cm² = (1/2)*(3h)*h . . . substitute given information
(2/3)*486 cm² = h² . . . . . .multiply by 2/3
√324 cm = h . . . . . . . . . . . . . .take the square root
The height is 18 cm.
The base is 3*18 = 54 cm.
