There is a ratio of 2 boys to 3 girls in a class. Which of the following are correct ratios for the class?

Mathematics

2 answers:

ankoles [38]2 years ago

6 0

All except for letter D

denis23 [38]2 years ago

4 0

All but the second one are correct

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Margarita [4]

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Using the Law of Cosines, in triangle DEF, if e=18yd, d=10yd, f=22yd, find measurement of angle D

Ivahew [28]

Check the picture below.

$\bf \textit{Law of Cosines}\\ \quad \\
c^2 = {{ a}}^2+{{ b}}^2-(2{{ a}}{{ b}})cos(C)\implies 
c = \sqrt{{{ a}}^2+{{ b}}^2-(2{{ a}}{{ b}})cos(C)}
\\\\\\
\cfrac{{{ a}}^2+{{ b}}^2-c^2}{2{{ a}}{{ b}}}=cos(C)\implies cos^{-1}\left(\cfrac{{{ a}}^2+{{ b}}^2-c^2}{2{{ a}}{{ b}}}\right)=\measuredangle C\\\\
-------------------------------\\\\
\begin{cases}
d=10\\
e=18\\
f=22
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3 years ago

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balandron [24]

Answer:

a)219.8

b)3846.5

Step-by-step explanation:

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b) area is pir^2, and radius is 1/2 of diameter, it would be 3.14*35^2, so 3.14*1225, so 3,846.5 in^2.

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Alinara [238K]

Answer:

Um 1 if you mean 1/3 then 3

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2 years ago

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