To be a quadratic function the highest power or a variable must be 2, therefor
Final answer:
A. y = x2 - 50
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Question # 1
Answer:

Step-by-step explanation:
Given the expression

∵ 
∵ 








Therefore,

Question # 2
Answer:

Step-by-step explanation:
Given

∵ 
∵ 










Therefore,

Answer:
78 inches
Step-by-step explanation:
perimeter of a kite formula: 2(a+b)
a= 18 inches
b= 21 inches
2(18+21)
2(39)
78 inches
Answer:
cosine
Step-by-step explanation:
fundamental trigonometric identities
D. x-6
That is the correct answer.