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3 years ago

Which of the following does not have triangular faces?

Mathematics

2 answers:

svp [43]3 years ago

5 0

Answer:

Step-by-step explanation:

Answer "A"

Dodecahedron

Alika [10]3 years ago

5 0

Answer:

Hexahedron is the right answer

Step-by-step explanation:

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I NEED HELP PLS THIS IS DUE IN 3 HOURS

Mariulka [41]

Answer:

Part 1) $x^{2} -2x-2=(x-1-\sqrt{3})(x-1+\sqrt{3})$

Part 2) $x^{2} -6x+4=(x-3-\sqrt{5})(x-3+\sqrt{5})$

Step-by-step explanation:

we know that

The formula to solve a quadratic equation of the form

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

is equal to

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

Part 1)

in this problem we have

$x^{2} -2x-2=0$

$a=1\\b=-2\\c=-2$

substitute in the formula

$x=\frac{-(-2)(+/-)\sqrt{-2^{2}-4(1)(-2)}} {2(1)}\\\\x=\frac{2(+/-)\sqrt{12}} {2}\\\\x=\frac{2(+/-)2\sqrt{3}} {2}\\\\x_1=\frac{2(+)2\sqrt{3}} {2}=1+\sqrt{3}\\\\x_2=\frac{2(-)2\sqrt{3}} {2}=1-\sqrt{3}$

therefore

$x^{2} -2x-2=(x-(1+\sqrt{3}))(x-(1-\sqrt{3}))$

$x^{2} -2x-2=(x-1-\sqrt{3})(x-1+\sqrt{3})$

Part 2)

in this problem we have

$x^{2} -6x+4=0$

$a=1\\b=-6\\c=4$

substitute in the formula

$x=\frac{-(-6)(+/-)\sqrt{-6^{2}-4(1)(4)}} {2(1)}$

$x=\frac{6(+/-)\sqrt{20}} {2}$

$x=\frac{6(+/-)2\sqrt{5}} {2}$

$x_1=\frac{6(+)2\sqrt{5}}{2}=3+\sqrt{5}$

$x_2=\frac{6(-)2\sqrt{5}}{2}=3-\sqrt{5}$

therefore

$x^{2} -6x+4=(x-(3+\sqrt{5}))(x-(3-\sqrt{5}))$

$x^{2} -6x+4=(x-3-\sqrt{5})(x-3+\sqrt{5})$

5 0

4 years ago

4(x+3)=6x+3x+7 solve for x.

sveta [45]

Answer:

X = 1

Step-by-step explanation:

$4(x + 3) = 6x + 3x + 7 \\ 4x + 12 = 9x + 7 \\ 12 - 7 = 9 x - 4x \\ 5 = 5x \\ x = 1$

4 0

3 years ago

Read 2 more answers

What is the y-intercept of the line perpendicular to the line y = x + 3 that includes the point (3, 1)? 3 5

Mumz [18]

Answer:

The y-intercept is y=1.

Step-by-step explanation:

7 0

3 years ago

Will mark as Brainliest

OleMash [197]

Answer:

32in^2

Step-by-step explanation:

1. you find the area of the triangles, which are all equal:

4*2/2 = 4. 4*4 = 16

2. find area of square:

4*4 = 16

3. add them together:

16+16 = 32

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3 years ago

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What does a residual value of 1.3 mean when referring to the line of best fit of a data set?

attashe74 [19]

The right answer for the question that is being asked and shown above is that: "A data point is 1.3 units above the line of best fit." a residual value of 1.3 mean when referring to the line of best fit of a data set is that <span>A data point is 1.3 units above the line of best fit.</span>

6 0

3 years ago

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