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Debora [2.8K]
3 years ago
13

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

hree options. 5(x2 + 4x + 4) = –7 + 20 x + 2 = Plus or minus StartRoot StartFraction 27 Over 5 EndFraction EndRoot 5(x2 + 4x) = 7 5(x2 + 4x + 4) = 7 + 20 5(x2 + 4x) = –7
Mathematics
1 answer:
Svetach [21]3 years ago
8 0

Answer:

2, 3, and 4 of Ed

Step-by-step explanation:

Saw another answer of brainly .

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Solve for x<br> If you don’t know how to do it don’t answer
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Your giving 5 points for this shi
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Which pairs of variables have a linear relationship? Select
Neko [114]

Answer:

Side length and perimeter of 1 face

Area of 1 face and surface area

Step-by-step explanation:

Suppose you are given cube with side length of x units.

Then

Side length = x units

Perimeter = 4x units

Area of 1 face =x^2 square units

Surface area =6x^2 square units

Volume =x^3 cubic units

A linear relationship is any equation that, when graphed, gives you a straight line.

Consider all options:

A. Side length and perimeter of 1 face is a linear relationship, because the graph of the function y=kx is a straight line.

B. Perimeter of 1 face and area of 1 face is not a linear relationship, because the graph of this relationship is a quadratic parabola with equation y=kx^2.

C. Surface area and volume is not a linear relationship, because the graph of this relationship is a curve with equation y=kx^{\frac{3}{2}}.

D. Area of 1 face and surface area is a linear relationship, because the graph of the function y=kx is a straight line.

E. Side length and volume is not a linear relationship, because the graph of this relationship is a cubic parabola with equation y=kx^3.

6 0
3 years ago
Read 2 more answers
Find the volume length 10 2/5 cm, width 3 cm, height 8 1/3 cm
AURORKA [14]

Answer:

260 cm

Step-by-step explanation:

formula for finding volume:

<u>l x w x h = v</u>

l=length   w=width    h=height    v=volume

10\frac{2}{5} × 3 × 8\frac{1}{3}

10\frac{2}{5} = \frac{52}{5}

how did i do that?

cross multiply the whole number and the denominator together and add the product by the numerator.

8\frac{1}{3} = \frac{25}{3}

so, \frac{52}{5} × \frac{25}{3} × \frac{3}{1}

cross simplify(dont have to do it just makes everything easier)

and you get:

\frac{52}{1} × \frac{5}{1} × \frac{1}{1}

and you get \frac{260}{1}

\frac{260}{1} = 260 cm

plz give me a brainliesttttt

4 0
4 years ago
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The cat is 12 feet above the ground and the ladder is 9 feet away from the tree because of the mud. How long does the ladder nee
marin [14]

Answer:

15 feet

Step-by-step explanation:

The ladder is the hypotenuse of a right triangle, with the legs being 9 ft and 12 ft long (see the picture).

To solve for the length of the ladder, use the Pythagorean Theorem.

9^{2} +12^{2} =c^{2} \\c=\sqrt{9^{2} +12^{2}} \\c=\sqrt{81+144} \\c=\sqrt{225} \\c=15

4 0
3 years ago
If the area of a park is exactly halfway between 2.4 and 2.5 acres, what is the area of the park? Explain. Please if you know th
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"If the area of a park is exactly halfway between 2.4 and 2.5 acres, what is the area of the park" its 2.45 acres.
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3 years ago
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