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2 years ago

Do you think you now the answer comment it down

Mathematics

2 answers:

evablogger [386]2 years ago

7 0

Answer: see below

Step-by-step explanation:

A. every rectangle is a quadrilateral because all rectangles have 4 sides (true)

B. false, quadrilaterals include squares, diamond, etc., not only rectangles

C. false; not to sure on this one so i’m sorry if u get this wrong

D. false, they can include other shapes not only squares

Veseljchak [2.6K]2 years ago

4 0

Answer:

1 = true

2 = false

3 = false

4 = false

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Answers ASAP simplify the ratio answer both questions

ruslelena [56]

Answer:

The answers are 40 : 1 and 16 : 5

Step-by-step explanation:

3. ) 400 : 10

Cancel out two of the zeros to get-

40 : 1

6. ) 1600m : 5km

1 km = 100 m, Therefore-

1600 : 500

Cancel out the zeros to get-

16 : 5

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3 years ago

A rectangular prism has a volume of 100 cubic meters. One of the dimensions is 5 meters. Which pair of measurements could be the

natali 33 [55]

Answer:

1, 4, and 5

Step-by-step explanation:

1 is correct because 5*5=25*4=100

2 is incorrect because 5*5=25*5=125

3 is incorrect because 5*4=20*4=80

4 is correct because 5*20=100*1=100

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4 years ago

Futhe Mathematics <img src="https://tex.z-dn.net/?f=%28Cos%20%7B%7D%5E%7B4%7Dt%20-Sin%20%7B%7D%5E%7B4%7Dt%20%29%20%20%5Cdiv%2

Nastasia [14]

Answer:

cos2t/cos²t

Step-by-step explanation:

Here the given trigonometric expression to us is ,

$\longrightarrow \dfrac{cos^4t - sin^4t }{cos^2t }$

We can write the numerator as ,

$\longrightarrow \dfrac{ (cos^2t)^2-(sin^2t)^2}{cos^2t }$

Recall the identity ,

$\longrightarrow (a-b)(a+b)=a^2-b^2$

Using this we have ,

$\longrightarrow \dfrac{(cos^2t + sin^2t)(cos^2t-sin^2t)}{cos^2t}$

Again , as we know that ,

$\longrightarrow sin^2\phi + cos^2\phi = 1$

Therefore we can rewrite it as ,

$\longrightarrow \dfrac{1(cos^2t - sin^2t)}{cos^2t}$

Again using the first identity mentioned above ,

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Or else we can also write it using ,

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Therefore ,

$\longrightarrow \underline{\underline{\dfrac{cos2t}{cos^2t}}}$

And we are done !

$\rule{200}{4}$

Additional info :-

Derivation of cos²x - sin²x = cos2x :-

We can rewrite cos 2x as ,

$\longrightarrow cos(x + x )$

As we know that ,

$\longrightarrow cos(y + z )= cosy.cosz - siny.sinz$

So that ,

$\longrightarrow cos(x+x) = cos(x).cos(x) - sin(x)sin(x)$

On simplifying,

$\longrightarrow cos(x+x) = cos^2x - sin^2x$

Hence,

$\longrightarrow\underline{\underline{cos (2x) = cos^2x - sin^2x }}$

$\rule{200}{4}$

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3 years ago

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