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jordnnnn102
05.07.2019 •
Mathematics
If twenty-four is subtracted from a number, the result is the same as the number divided by nine. what is the number?
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Ответ:
multiply through by 9:-
9x - 216 = x
8x = 216
x = 27 answer
Ответ:
Let's assume CD=h, BD=x.
tan 24°=h/x ==>h=x*tan 24°
tan 16°=h/(7600+x)==>h=tan 16° *(7600+x)
==>x tan 24°=tan 16°*(7600+x)
==>x=(7600*tan 16°)/(tan 24°-tan 16°)
h=x*tan 24= (7600*tan 16°*tan 24°)/(tan 24°-tan16°)
b) CD=h=6122,2303...≈6122 (feet)
a) BC=h/sin 24°=15052,0746448...≈15052 (feet)
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