This is true. It is called the exterior angle theorem. An example would taking a right triangle. An outside angle of the right angle would also be 90, while the remaining two inside's sum would also be 90.
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For simple interest rate,
I=P(i)t
54=900(i)(18/12)
i=54/900*(12/18)=4% annually
Answer: 20
Step-by-step explanation:
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