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3 years ago

15 = 3n + бр. help!

Mathematics

1 answer:

Alla [95]3 years ago

3 0

15 is the awnser too this one

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Four friends bought tickets to the school play if it cost them a total of $28 find how much each friend paid?

galina1969 [7]

Answer:

28:4=7

Pls mark as brainliest

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3 years ago

Giving 20 point BRAINLIST if you help fast!

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3 years ago

Read 2 more answers

PLEASE HELP WILL GIVE BRAINLIEST<br> 30 POINTS

Annette [7]

Answer:

Step-by-step explanation:

y<2

y<x+2

y>-1/4-3

if you plug in one of the points in the included grey area the equations should be true

7 0

2 years ago

Find the equation of locus of a point which moves such that its distance from (0,2) is one third distance from (-2,3). ( I WILL

scoray [572]

Answer:

$8(x^2+y^2)-4x-30y+23=0$

Step-by-step explanation:

<u />

<u>Distance formula</u>

$\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

Let P(x, y) = any point on the locus

Let A = (0, 2)

Let B = (-2, 3)

If a point moves such that its distance from (0, 2) is one third distance from (-2, 3):

$PA=\dfrac{1}{3}PB$

Therefore, using the distance formula:

$\implies \sqrt{(x-0)^2+(y-2)^2}=\dfrac{1}{3}\sqrt{(x-(-2))^2+(y-3)^2}$

Square both sides:

$\implies x^2+(y-2)^2=\dfrac{1}{9}[(x+2)^2+(y-3)^2]$

$\implies x^2+y^2-4y+4=\dfrac{1}{9}(x^2+4x+4+y^2-6y+9)$

Multiply both sides by 9:

$\implies 9x^2+9y^2-36y+36=x^2+4x+4+y^2-6y+9$

$\implies 8x^2+8y^2-4x-30y+23=0$

$\implies 8(x^2+y^2)-4x-30y+23=0$

3 0

2 years ago

I BET NO ONE KNOWS THIS y varies jointly as x and z. y=20 when x=2 and z=5 . Find y when x=3 and z=6

Greeley [361]

Hello!

If y varies jointly with x and z, it'll mean that x and z are being multiplied by a factor "k", to equal y.

To give you a visual, this is what I mean.

$y=kxz$

That means we'll want to find $k$ with the first point we're given: $(2,20,5)$

$20=k(2)(5)$

$20=10k$

$k=2$

Which means our equation is:

$y=2xz$

Now, let's plug in the $x$ and $z$ from the other point to find $y$ .

$y=2(3)(6)$

$y=36$

Hope this helps!

6 0

3 years ago