Answer : The correct option is, (B) 1500 cubic yards.
Step-by-step explanation :
Formula used to calculate the volume of square pyramid is:

where,
V = volume of pyramid
a = base edge of pyramid
h = height of pyramid
Given:
Base edge of pyramid = 15 yards
Height of pyramid = 20 yards
Now putting all the given values in the above formula, we get:



Therefore, the volume of pyramid is 1500 cubic yards.
Since F(X) = 3^X,
F(4) = 3^4 = 81
Answer:
The second one decreasing on the interval (-infinity, 0) where it becomes constant
d(x) = { (x,y): y = sqrt(x) and y >=0 }
since sqrt function requires x to be >=0 so
<u>x >= 0</u>