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4 years ago

Is 7/11 rational or irrational?

Mathematics

2 answers:

sattari [20]4 years ago

8 0

The answers is Rational. hope that helps

Readme [11.4K]4 years ago

7 0

Yes, it is rational number.

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A curve in polar coordinates is given by: r=9+3cosθ. Point P is at θ=21π/18 .?

ikadub [295]

Answer:

Step-by-step explanation:

Given that a curve in polar coordinates is given by:

r=9+3cosθ

a) At point P, we have

$θ=\frac{21\pi}{18}$

Substitute to get

$r=9+cos \frac{21\pi}{18}\\=9.3932$

b) Cartesian coordinate is

$x= rcos \theta=3.6934\\y =r sin \tjeta =8.6365$

c) At the origin r =0

when r =0

we have

$9+3cos\theta=0\\cos\theta =-3$

Since cos cannot take values as -3 it doe snot pass through origin.

6 0

3 years ago

Solve 2x+y=-1 and -x+y=-7 in substitution method

lesantik [10]

Answer:x=2 y=-5

Step-by-step explanation

3 0

3 years ago

2×_9/10+2×-3/2×-1=×/5

trasher [3.6K]

Answer:

-0.12

Step-by-step explanation:

3 0

3 years ago

Which statements are true? (look at picture)

Makovka662 [10]

Answer:

D is true, E is true, F is true

Step-by-step explanation:

Hello,

n is an odd number it means that n = 2a+1 where a is integer

$n^2-1=(2a+1)^2-1=4a^2+4a+1-1=4a(a+1)$

this is not an odd number

$n(n-1)=(2a+1)2a$

this is not an odd number

$(n-1)^2=(2a+1-1)^2=4a^2$

this is not an odd number

$n^2+2=(2a+1)^2+2=4a^2+4a+1+2=4a^2+4a+3= 2(2a^2+2a+1)+1$

so this is an odd number

$n(n-2)=(2a+1)(2a-1)=4a^2-1=4a^2-2+1=2(2a^2-1)+1$

so this is an odd number

$(n-2)^2=(2a+1-2)^2=(2a-1)^2=4a^2-4a+1 = 2(2a^2-2a)+1$

this is an odd number

hope this helps

7 0

3 years ago

Valeria has a new beaded necklace. 18 out of the 20 beads on the necklace are blue. What percentage of beads on Valeria's neckla

ANTONII [103]

Answer:

nFtmamtamysktakysykzylyu

6 0

3 years ago

Read 2 more answers