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Ksenya-84 [330]

3 years ago

7

two boys move simultaneously towards each other from two objects located at a distance of 7.5km. The speed of one is as much as

2/3 of the speed of the other. Find the speeds of each if they meet after 1.5 hours

1 answer:

dusya [7]3 years ago

6 0

Down open that link, it’s a virus

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seraphim [82]

Answer:

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Step-by-step explanation:

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If angle a has the terminal ray that falls in the fourth quadrant and cosine a equals 5/9 then determine the value of sin a in s

Tema [17]

Answer: $-\dfrac{2\sqrt{14}}{9}$

Step-by-step explanation:

Given

$\cos a=\dfrac{5}{9}$

$a$ lies in the fourth quadrant

So, sine must be negative in the fourth quadrant

Using identity $\sin ^2 x+\cos^2 x=1$ to find sine value

$\Rightarrow \sin^2 a=1-\dfrac{5^2}{9^2}$

$\\\\\Rightarrow \sin^2 a=1-\dfrac{25}{81}\\\\\\\Rightarrow \sin^2 a=\dfrac{56}{81}\\\\\\\Rightarrow \sin a=-\sqrt{\dfrac{56}{81}}\\\\\\\Rightarrow \sin a=-\dfrac{2\sqrt{14}}{9}$

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Lelu [443]

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Lubov Fominskaja [6]

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