First one is D and Second one is B
Answer:
Explanation:
Given dish width= 48ft
Depth = 4ft
Using equation of a parabola
x²= 4py
48² = 4p 4
4p = 576
P= 144ft
Thus the the receiver should be placed 144ft from t the vertex
92 percent because you multiply it by 2
Answer:Ca
Explanation:fact according to the periodic table
