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2 years ago

5x= -4y +4 when x= 1,2,3

Mathematics

1 answer:

Nataliya [291]2 years ago

3 0

I hope this helps you

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Solve 2x2 + 20x = −38. (1 point)

RoseWind [281]

Answer:

The solutions are $x=-5+\sqrt{6}$ and $x=-5-\sqrt{6}$

Step-by-step explanation:

we have

$2x^{2} +20x=-38$

Divide by $2$ both sides

$x^{2} +10x=-19$ ------> $x^{2} +10x+19=0$

we know that

The formula to solve a quadratic equation of the form $ax^{2} +bx+c=0$ is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$x^{2} +10x+19=0$

$a=1\\b=10\\c=19$

substitute

$x=\frac{-10(+/-)\sqrt{10^{2}-4(1)(19)}}{2(1)}$

$x=\frac{-10(+/-)\sqrt{100-76}}{2}$

$x=\frac{-10(+/-)\sqrt{24}}{2}$

$x=\frac{-10(+/-)2\sqrt{6}}{2}$

$x1=\frac{-10(+)2\sqrt{6}}{2}=-5+\sqrt{6}$

$x2=\frac{-10(-)2\sqrt{6}}{2}=-5-\sqrt{6}$

8 0

3 years ago

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Drag each percent to match the situation. Each percent may be used only once.

Svetllana [295]

Answer:

1:80%

2:95%

3:15%

4:33 1/2%

7 0

3 years ago

Questlon 4 of 10

Kisachek [45]

Answer:

Step-by-step explanation:

To find the midpoint the formulas

x=x1+x2/2 and y=y1+y2/2 are used

in this case x1 is 5,x2 is 5,y1 is 4 and y2 is -3

therefore

x=5+5/2.

=10/2

=5

y=4+(-3)/2

=1/2

3 0

3 years ago

Write the number 45.78 trillion in scientific notation.

beks73 [17]

Without scientific notation it would look like 4 000 000 000 000 
The decimal place must be moved 12 units to the left to be after a significant figure, thus giving the scientific notation to the power of 12. The significant figure is 4 so you get the equation 4.0⋅1012.

4 0

3 years ago

Somebody please help me thansk

ad-work [718]

Answer:

y=-2x-1

Step-by-step explanation:

7 0

3 years ago

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