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2 years ago

9. You have a globe that has a diameter of 22 inches. Find the volume of

Mathematics

1 answer:

Savatey [412]2 years ago

3 0

I think the answer is that what i think

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Please help I,think it's A but I don't know what to do

Nimfa-mama [501]

Answer:

(x,y) - (x,-y)

Step-by-step explanation:

It starts in the top right corner which is positive x and y and then it is reflected across the x-axis which has a positive x and negative y

4 0

2 years ago

Simplify 12a-(4b+4a)-b

lara31 [8.8K]

12a-(4b+4a)-b
12a-4b-4a-b
=> 8a-5b

8 0

3 years ago

Read 2 more answers

Expand. Your answer should be a polynomial in standard form. (x-1)(x+4)=

Montano1993 [528]

Answer:

X^2+3x-4

Step-by-step explanation:

This is the answer

8 0

2 years ago

Read 2 more answers

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 ,

$\longrightarrow \underline{\underline{\dfrac{(cost + sint )(cost - sint)}{cos^2t}}}$

Or else we can also write it using ,

$\longrightarrow cos2\phi = cos^2\phi - sin^2\phi$

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,

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

$\rule{200}{4}$

7 0

1 year ago

Sam has 4 gallons of juice. Each glass holds 1/5 of a gallon . How many glasses can he fill

Softa [21]

Answer:

Step-by-step explanation:

Divide 4 by 1/5 in decimal form, 1/5 in decimal form is 0.20. You can get the decimal form by dividing 1 by 5.

So 4/0.20 = 20.

6 0

2 years ago