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caroline1484
22.06.2019 •
Mathematics
Which statement is true about the given expression? 3: 2 – 11(2y + 1) + 4 a. the "3" in the first term is an exponent b. the "u" in the second term is a constant. c. the "4" in the third term is a factor. d. the "2" in the second term is a coefficient reset next
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Ответ:
ABD = 180 - 65 = 115 degrees
ADB = 180 - 45 - 115 = 20 degrees
First box, no check.
ACD is 90 degrees, so
second box, no check
Law of Sines:
AB / sin ADB = AD / sin ABD
AD = AB (sin ABD / sin ADB ) = 18 (sin 115 / sin 20) = 47.6976
ACD is an isosceles right triangle so
CD = 47.6976/√2 = 33.7
CD=33.7, CHECK
sin 65 = CD/BD
BD = CD/sin 65 = 33.7/sin 65 = 37.2
BD=37.2 CHECK