3 years ago

Pls help urgently extra points and mark brainlist

Mathematics

1 answer:

den301095 [7]3 years ago

8 0

Answer:

the third one

Step-by-step explanation:

9 to the power of 4 is 9 multiplied by it's self 4 times

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Mr adkins has 2 packages, each with 6 batteries. He uses 4 of the batteries in a flashlight . How many batteries does he have le

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Answer:

Step-by-step explanation:

2 x 6 = 12

12 - 4 = 8

So, our answer is 8.

8 0

3 years ago

Read 2 more answers

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

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