3 years ago

Y varies inversely with x: If y = 10 while x = 3, find y when x = 6.

Mathematics

1 answer:

oksian1 [2.3K]3 years ago

8 0

Answer:

y= 5

Step-by-step explanation:

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If cosх A/2 =3/5, find the value of cos A

nikitadnepr [17]

Answer:

cosA = - $\frac{7}{25}$

Step-by-step explanation:

Using the double angle identity

cos2A = 2cos²A - 1 , then

cosA = 2cos²( $\frac{A}{2}$ ) - 1 , that is

cosA = 2 × ( $\frac{3}{5}$ )² - 1

= 2 × $\frac{9}{25}$ - 1

= $\frac{18}{25}$ - $\frac{25}{25}$

= - $\frac{7}{25}$

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Elodia [21]

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Step-by-step explanation:

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