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3 years ago

Please answer this for me <3

Mathematics

1 answer:

zloy xaker [14]3 years ago

5 0

Answer:

I think its D

Step-by-step explanation:

i might be wrong

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Find the slope of line. y= -3x-1

Paladinen [302]

Answer:

*****Slope: M = -3*****

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3 years ago

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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

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3 years ago

Fun fact Tennis players are not allowed to swear when they are playing in Wimbledon

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If i was a tennis player playing in wimbledon i would break that rule ;-;

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2 years ago

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60ml of liquid is poured into a cuboidal tank with a length of 4.5cm, a width of 3.5cm and a height of

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yo emanuael

Step-by-step explanation:

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2 years ago

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A student states that the constant of proportionality is 2.5 since 10 - 7.5 = 2.5.

Svetradugi [14.3K]

I cannot see the table. But if I could that would be helpful.

But, if you were to look at the table see if the numbers are increasing or decreasing for the y column. Once you figure this out, find out how much the numbers are increasing/decreasing by and that should be the answer for the constant of proportionality. If it is decreasing, it would be a negative number. If it is increasing, it would be a positive number.

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4 years ago