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2 years ago

Determine whether y varies directly with x. If so, find the constant of variation and write the function rule.

1 answer:

4 0

Yes they are, the constant variation is that for every 3 added to the x side, 1 is added to the y side. I would really appreciate the brainliest mark thanks!

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I need help on my math

Alina [70]

#1 is three feet
#2 is 400 feet and #4 a is 2 cm sq. And b is 2.5 cm sq.

4 0

2 years ago

invent three meaningful algebatric expressions of your own from the list of variables and enter them into the table below.write

Mars2501 [29]

Answer:

Step-by-step explanation:

4 0

2 years ago

5/6 N=10 solve this problem. I could not put the six under the five where it belongs. please show the work

Andreyy89

5/6N = 10

Mutiply by 6/5

So N=12

3 0

3 years ago

Y = –3x – 5 help I don’t know the answer please

earnstyle [38]

Answer:

x=-5/3

Step-by-step explanation:

Add 5 to both sides to get 5=-3x.

Then divide by -3.

And get -5/3=x

6 0

2 years ago

What is the sum of 20x^2-10x-30

ivann1987 [24]

Answer:

The sum of the roots is 0.5

Step-by-step explanation:

The correct question is

What is the sum of the roots of 20x^2-10x-30

we know that

In a quadratic equation of the form

$ax^{2} +bx+c=0$

The sum of the roots is equal to

$-\frac{b} {a}$

in this problem we have

$20x^{2} -10x-30=0$

$a=20\\b=-10\\c=-30$

substitute

$-\frac{(-10)} {20}=0.5$

Verify

Find the roots of the quadratic equation

The formula to solve a quadratic equation is equal to

$x=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}$

$a=20\\b=-10\\c=-30$

substitute

$x=\frac{-(-10)\pm\sqrt{-10^{2}-4(20)(-30)}} {2(20)}$

$x=\frac{10\pm\sqrt{2,500}} {40}$

$x=\frac{10\pm50} {40}$

$x=\frac{10+50} {40}=1.5$

$x=\frac{10-50} {40}=-1$

The roots are x=-1 and x=1.5

The sum of the roots are

$-1+1.5=0.5$ ----> is ok

5 0

3 years ago