Answer:
x = -11
Step-by-step explanation:

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Answer:

Step-by-step explanation:
Cosine (cos) is adjacent by hypotenuse. 
In any of the 45° angles, 1 is adjacent and √2 is the hypotenuse.
So arrange them to get 
Answer:
D) 500 square feet
Step-by-step explanation:
20x40=800
30x10=300
800-300=500