lilobekker6976
15.03.2022 •
Mathematics
Please help!
A building is constructed on top of a cliff that is 300 meters high. A person standing on level ground below the cliff observes that the angle of elevation to the top of the building is 72° and the angle of elevation to the top of the cliff is 63°.
a. How far away is the person from the base of the cliff?
b. What is the building’s height?
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Ответ:
Option D
86
Step-by-step explanation:
When your expectation is average of 81 for a total of 10 questions, your total score is 10*81=810
Currently, for 5 questions with an average of 76, your total score is 5*76=380
Difference between total expected score and current score is 810-380=430
Average of difference with 5 questions is 430/5= 86