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3 years ago

What are two lines in the same plane that intersect at right angles?

Mathematics

2 answers:

Tems11 [23]3 years ago

5 0

The correct answer is B.line Segment

Hope this helps

andrew11 [14]3 years ago

3 0

Answer:

its d trust me im on usatestprep

Step-by-step explanation:

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I need help with this math work

AveGali [126]

............................

4 0

3 years ago

Rewrite with only sin x and cos x.

Annette [7]

Option A

$\cos 3 x=\cos x-4 \cos x \sin ^{2} x$

Solution:

Given that we have to rewrite with only sin x and cos x

Given is cos 3x

$cos 3x = cos(x + 2x)$

We know that,

$\cos (a+b)=\cos a \cos b-\sin a \sin b$

Therefore,

$\cos (x+2 x)=\cos x \cos 2 x-\sin x \sin 2 x$ ---- eqn 1

We know that,

$\sin 2 x=2 \sin x \cos x$

$\cos 2 x=\cos ^{2} x-\sin ^{2} x$

Substituting these values in eqn 1

$\cos (x+2 x)=\cos x\left(\cos ^{2} x-\sin ^{2} x\right)-\sin x(2 \sin x \cos x)$ -------- eqn 2

We know that,

$\cos ^{2} x-\sin ^{2} x=1-2 \sin ^{2} x$

Applying this in above eqn 2, we get

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

$\begin{aligned}&\cos (x+2 x)=\cos x-2 \sin ^{2} x \cos x-2 \sin ^{2} x \cos x\\\\&\cos (x+2 x)=\cos x-4 \sin ^{2} x \cos x\end{aligned}$

$\cos (x+2 x)=\cos x-4 \cos x \sin ^{2} x$

Therefore,

$\cos 3 x=\cos x-4 \cos x \sin ^{2} x$

Option A is correct

7 0

2 years ago

I need help asap.

skad [1K]

Answer:

435=107+82+246

Step-by-step explanation:

I think this is correct. Someone correct me if I am wrong, but I took 435 and subtracted 107, then I took that number and divided it by 4 and took one of those 4 and put it in the equation then multiplied the last three.

3 0

2 years ago

Keevyn has a bag of Jolly Ranchers. Keevyn gave 3/8 of the bag to Zavion and 1/4 of the bag to Qeisha. Then keeyvn gave 1/2 of t

sergejj [24]

Answer:

1.5/8 of the bag

Step-by-step explanation:

1/4 * 2 = 2/8

----------------------

3/8 + 2/8 = 5/8

1 - 5/8 = 3/8

3/8 divided by 1/2 = 1.5/8

3 0

2 years ago

Read 2 more answers

If it takes 20 seconds to ring up a customer how many items are being purchased

valkas [14]

Answer: proly like 2

Step-by-step explanation:

Because you have to pay and scan!

5 0

2 years ago