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2 years ago

Please help i dont understand these and i need help

Mathematics

1 answer:

likoan [24]2 years ago

7 0

Answer:

it is 200

Step-by-step explanation:

2 take 2 add 20 add a sec 0

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Help me please..........

denis-greek [22]

Answer:

oof thats hard

Step-by-step explanation:

6 0

3 years ago

Help! This is due tomorrow!

Ira Lisetskai [31]

So you're combining equations correct?

6 0

3 years ago

Read 2 more answers

-x+3=-3d-3r, for x .

OLga [1]

Answer:

x=3d+3r+3

Step-by-step

5 0

3 years ago

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

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

7 0

4 years ago

If SA=1/2lp+B, find p What is the formula for finding p?

Ilia_Sergeevich [38]

You must get p by itself, so first subtract B from both sides: SA-B=1/2lp. Then multiply both sides by 2, which cancels out the 1/2: 2SA=lp. Then divide both sides by l: (2SA)/l=p.

8 0

3 years ago