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2 years ago

Anyone kno number 10

Mathematics

2 answers:

deff fn [24]2 years ago

6 0

Answer:

It's A

you multiply the 18ft by the 25ft and get 450 then divide that by 20 which gives you your missing number which is 22.5ft

QveST [7]2 years ago

3 0

We Can’t Really See It

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Step-by-step explanation:

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3 years ago

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2 years ago

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3 years ago

Angle x is a third quadrant angle such that cos x = -1/5.

Yuki888 [10]

Starting from the formula

$\cos^2(x)=\dfrac{1+\cos(2x)}{2}$

We can divide all the angles by 2 and we get

$\cos^2\left(\dfrac{x}{2}\right)=\dfrac{1+\cos(x)}{2}$

And finally

$\cos\left(\dfrac{x}{2}\right)=\pm\sqrt{\dfrac{1+\cos(x)}{2}}$

Angle x is a third quadrant angle, meaning that it is somewhere between 180 and 270. This implies that x/2 lies between 90 and 135. So, x/2 is a second quadrant angle, and its cosine is negative. This means that we can update the previous equation to

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You know that

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so, plug that value into the expression and you'll get cos(x/2).

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3 years ago