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Answer: 
Step-by-step explanation:
Given
String of the kite is 
Angle of elevation 
suppose altitude of the kite is h
from the figure, we can write

Thus, the altitude of the kite is 
Answer:
D
Step-by-step explanation:
0=3x-7
0=3x+7
7=3x/3
7/3=x
Answer:
No.
Step-by-step explanation:
(x+1)^2=(x+1)(x+1)=x^2+x+x+1=x^2+2x+1
This is different from x^2+1.
Thus, they are not equivalent.
It is 21. Seven 1/7th's makes 7/7 which equals one. So multiply 7x3 and that is 21.