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nydimaria [60]
3 years ago
13

Can someone pls help me with this question

Mathematics
1 answer:
Brilliant_brown [7]3 years ago
3 0
Ñjrjr es dos did zo si :83!/83$374 ejes. Endientenfndkdkemdbsud end
Fue fue dmdjd dj
En ese e r
R
F fun
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Mario’s company makes unusually shaped imitation gemstones. One gemstone had 10 faces and 12 vertices. How many edges did the ge
Evgen [1.6K]
20 edges 
F=12, V=10
V -E+F=2
10-E+12=2
-E+22=2
-E=-20
E=20
8 0
4 years ago
Read 2 more answers
Solve using the quadratic formula. Show all work. Write each solution in simplest form. No decimals.
r-ruslan [8.4K]

Given:

The given quadratic equation is:

12a^2+9a+7=0

To find:

The solution for the given quadratic equation in simplest form by using the quadratic formula.

Solution:

Consider a quadratic equation is defined as ax^2+bx+c=0, then the quadratic formula is:

x=\dfrac{-b\pm \sqrt{b^2-4ac}}{2a}

The given quadratic equation is:

12a^2+9a+7=0

We have, a=12,b=9,c=7. Using the quadratic formula, we get

x=\dfrac{-(9)\pm \sqrt{(9)^2-4(12)(7)}}{2(12)}

x=\dfrac{-9\pm \sqrt{81-336}}{24}

x=\dfrac{-9\pm \sqrt{-255}}{24}

x=\dfrac{-9\pm i\sqrt{255}}{24}              [\because \sqrt{-a}=i\sqrt{a}]

The solutions of the given equations are x=\dfrac{-9-i\sqrt{255}}{24} and x=\dfrac{-9+i\sqrt{255}}{24}.

Hence, the correct option is B.

3 0
3 years ago
The question is below, plz answer, will give brainliest
Elina [12.6K]

By comparing the right triangle ABC with the triangle XYZ, we will see that:

  • AC = 5
  • BC = 10.

<h3>How to find the given segments?</h3>

So we know that the largest triangle is a dilation of scale factor 2 of the smaller one.

Also, remember that for right triangle we have the relation:

Tan(θ) = (opposite cathetus)/(adjacent cathetus).

Now, the problem tells us that:

tan(x) = 5/2.5

For the angle x, the adjacent cathetus is XY, and the opposite cathetus is YZ.

Then we have:

YZ  = 5

XY = 2.5

Knowing that the correspondent sides in the larger triangle will be 2 times the above ones, we can see that:

AC = 2*XY = 2*2.5 = 5

CB = 2*YZ = 2*5 = 10

If you want to learn more about right triangles, you can read:

brainly.com/question/2217700

5 0
2 years ago
Which equation of the line written in standard form has has a slope of 6 and contains the points (-1,-3)
11Alexandr11 [23.1K]

keeping in mind that standard form for a linear equation means

• all coefficients must be integers, no fractions

• only the constant on the right-hand-side

• all variables on the left-hand-side, sorted

• "x" must not have a negative coefficient

\bf (\stackrel{x_1}{-1}~,~\stackrel{y_1}{-3})~\hspace{10em} slope = m\implies 6 \\\\\\ \begin{array}{|c|ll} \cline{1-1} \textit{point-slope form}\\ \cline{1-1} \\ y-y_1=m(x-x_1) \\\\ \cline{1-1} \end{array}\implies y-(-3)=6[x-(-1)]\implies y+3=6(x+1) \\\\\\ y+3=6x+6\implies y=6x+3\implies -6x+y=3\implies 6x-y=-3

5 0
3 years ago
You reflect triangle PQR, with coordinates P(-4, -4), Q(-1, -3), and R(-3, -1), across the x-axis, across the y-axis, and across
notka56 [123]

Answer:

  P'( 4, -4)

Step-by-step explanation:

The double reflection across the x-axis does nothing, so the net effect is a single reflection across the y-axis. That effect is to negate the x-coordinate:

  reflection across y-axis: (x, y) ⇒ (-x, y)

  Then P(-4, -4) ⇒ P'(4, -4)

4 0
3 years ago
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