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4 years ago

The difference between 3 1/2 and 1 4/5 a 2 4/5 b 2 7/10 c 1 4/5 d 1 7/10

Mathematics

2 answers:

AlekseyPX4 years ago

8 0

Answer is D :)!!!!!!

Alex4 years ago

6 0

Answer:

the correct answer is d

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Prove that if sin (2 + y) = 3 sin (x - y), then tan x = 2 tany.

nignag [31]

Answer:

The proof is given below.

Step-by-step explanation:

Given: ( the correct question and ans is as follow )

sin (x + y) = 3sin ( x - y)

To Prove

tan x = 2 tan y

Proof:

$\sin (x+y) = 3\sin (x-y)$

Using the identities

$\sin (A+B) = \sin A.\cos B + \cos A.\sin B\\and\\\sin (A-B) = \sin A.\cos B - \cos A.\sin B\\$

we get

$\sin x.\cos y + \cos x.\sin y = 3(\sin x.\cos y - \cos x.\sin y)\\\sin x.\cos y + \cos x.\sin y = 3\sin x.\cos y - 3\cos x.\sin y$

Now we will take sin x . cos y to the left hand side and cos x . sin y to the right hand side,we get

$3\sin x.\cos y - \sin x.\cos y = 3\cos x.\sin y +\cos x.\sin y\\2\sin x.\cos y =4\cos x.\sin y\\\sin x.\cos y =2\cos x.\sin y \ \textrm{4 divide by 2}\\ \frac{\sin x}{\cos x} =2\times \frac{\sin y}{\cos y} \\\textrm{we know identity }\\\frac{\sin x}{\cos x} = \tan x\\\frac{\sin y}{\cos y} = \tan y\\\therefore \tan x = 2\tan y\ ...............{PROVED}$

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4 years ago

Solve for x<br> ಠ_ಠ ಠ_ಠ ಠ_ಠ ಠ_ಠ ಠ_ಠ ಠ_ಠ ಠ_ಠ ಠ_ಠ ಠ_ಠ ಠ_ಠ ಠ_ಠ ಠ_ಠ ಠ_ಠ ಠ_ಠ ಠ_ಠ

Pavel [41]

:)

x+x+55+x+38=180

3x+93=180

3x=87

x=29°

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3 years ago

At the beginning of the week, a puppy weighed 5 1/4 pounds. During the week, the puppy gains 8 ounces.

lys-0071 [83]

Answer:

5 3/4

Step-by-step explanation:

8 ounces is half (1/2) of a pound

1/2 is equivalent to 2/4

So I added 5 1/4 and 2/4

Which gives us 5 3/4

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3 years ago

ABCDEFGH is a regular octagon. The minimum degree of rotation by which this octagon can map onto itself is °. It will take incre

il63 [147K]

I don't see the image

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4 years ago

You drive in a car for 4.5 hour at an average speed 70 miles per hour. How far did you go?

Natalija [7]

Answer:

315 hours

Step-by-step explanation:

Good luck

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3 years ago