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3 years ago

(05.05)

Mathematics

2 answers:

Semenov [28]3 years ago

5 0

Answer:

I'm pretty sure its x is less than or equal to -7.

Step-by-step explanation:

But its definitely not y is greater than or = to -7 nor is it y is less than or equal to -7. Because that'd be on the y-axis and in the picture the line is on the x axis.

Natalka [10]3 years ago

3 0

Y greater than or equal to -7

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Sergey is solving 5x2 + 20% – 7 = 0. Which steps could he use to solve the quadratic equation by completing the

Mrac [35]

Answer:

$5(x^2+4x)=7$

$5(x^2+4x+4)=7+20$

$(x+2)=\pm\sqrt{\frac{27}{5}}$

Step-by-step explanation:

we have

$5x^2+20x-7=0$

step 1

Group terms that contain the same variable, and move the constant to the opposite side of the equation

$5x^2+20x=7$

step 2

Factor 5 left side

$5(x^2+4x)=7$

step 3

Complete the square

$5(x^2+4x+2^2)=7+2^2(5)$

$5(x^2+4x+4)=7+20$

$5(x^2+4x+4)=27$

step 4

Rewrite as perfect squares

$5(x+2)^2=27$

step 5

$(x+2)^2=\frac{27}{5}$

$(x+2)=\pm\sqrt{\frac{27}{5}}$

$(x+2)=\pm\frac{3\sqrt{15}}{5}$

step 6

$x=-2\pm\frac{3\sqrt{15}}{5}$

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3 years ago

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80 is 16 1/2 % of what number round to the nearest hundredth

Alex Ar [27]

Answer:

484.84

Step-by-step explanation:

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Degger [83]

Answer:

M = K =

Step-by-step explanation:

M = K, because it's a kite.

Kite has 2 angles on the left and right, each with the same size,
The kite also has different angles at the other angle points.

(Addition of kite angles result in 360°)

Therefore

360 = 63 + 95 + 2M

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The size of each angle M and angle K = 101 degrees.

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Let the un know number be p

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