Is the expression a valid way to calculate a 15% tip on a cab fare of d dollars? Answer yes or no

EXPRESSION

0.10d + 0.05d Yes or No

0.85d Yes or No

1.015d Yes or No

0.15d Yes or no

you estimate that the angle of elevation to the top of the 86th floor (the observatory) is 82 .the total height of the building is another 123 meters above the 86th floor.

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answer: i ! the answer is   9000 seconds, also d

hope i

-lavira : )