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Crazy boy [7]
3 years ago
6

2 less then 5 times a number

Mathematics
1 answer:
Alex3 years ago
4 0

Answer:

5-2n

Step-by-step explanation:

You might be interested in
Convert the Cartesian equation (x 2 + y 2)2 = 4(x 2 - y 2) to a polar equation.
SashulF [63]

<u>ANSWER</u>

{r}^{2}  = 4  \cos2\theta

<u>EXPLANATION</u>

The Cartesian equation is

{( {x}^{2}  +  {y}^{2} )}^{2}  = 4( {x}^{2} -  {y}^{2}  )

We substitute

x = r \cos( \theta)

y = r \sin( \theta)

and

{x}^{2}  +  {y}^{2}  =  {r}^{2}

This implies that

{( {r}^{2} )}^{2}  = 4(( { r \cos\theta)  }^{2} -  {(r \sin\theta) }^{2}  )

Let us evaluate the exponents to get:

{r}^{4}  = 4({  {r}^{2} \cos^{2}\theta } -   {r}^{2}  \sin^{2}\theta)

Factor the RHS to get:

{r}^{4}  = 4{r}^{2} ({   \cos^{2}\theta } -   \sin^{2}\theta)

Divide through by r²

{r}^{2}  = 4 ({   \cos^{2}\theta } -   \sin^{2}\theta)

Apply the double angle identity

\cos^{2}\theta -\sin^{2}\theta=  \cos(2 \theta)

The polar equation then becomes:

{r}^{2}  = 4  \cos2\theta

7 0
3 years ago
What is bigger 7/8 or 13/15?
erastovalidia [21]
The answer would be 13/15
8 0
3 years ago
Factor 15c·(a+b)+8·(b+a)
AleksAgata [21]

Answer:

(15c + 8)(a + b).

Step-by-step explanation:

15c·(a+b)+8·(b+a)

(a + b) is common to both parts:

= (15c + 8)(a + b).

8 0
3 years ago
I need help extra points and work brainlyisr
arsen [322]

Answer:

106.25

Step-by-step explanation:

if u multiply 8.5 by 12.5 then you get 106.25 :)

8 0
3 years ago
C
ElenaW [278]
Hold on let me go do my research I’ll brb .
4 0
3 years ago
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