Which of the following is the axis of symmetry

Mathematics

2 answers:

svp [43]3 years ago

4 0

Where are the options?

saw5 [17]3 years ago

3 0

What are the options?

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Rita = 2500

ExtremeBDS [4]

Let the price at which she sells the hi-fi set be x ~

$\huge \bf༆ Answer ༄$

The Money that she lose at the end of 2 years :

$\sf \: 2500 - x$

Loss percentage is equal to :

$\sf \dfrac{2500 -x }{2500} \times 100 = 20$

$\sf \dfrac{2500 - x}{25} = 20$

$\sf2500 - x = 20 \times 25$

$\sf2500 - x = 500$

$\sf - x = 500 - 2500$

$\sf - x = - 2000$

$\sf x = 2000$

So, the money she end up getting after selling that hi-fi set is 2500, that is also the money She have at the end of the two years ~

$꧁ \:\large \rm{kaul} \: ꧂$

6 0

3 years ago

Find an equation of the plane. The plane that passes through the line of intersection of the planes x − z = 3 and y + 2z = 3 and

IgorLugansk [536]

Answer:

x-y-3=0

Step-by-step explanation:

Choose two common points on the line of intersection of the planes x − z = 3 and y + 2z = 3:

1st point: if x=0, then z=-3 and y=3-2z=3+6=9, so the 1st point is (0,-3,9);
2nd point: if x=3, then z=0 and y=3-2z=3-0=3, so the 2nd point is (3,0,3).

The perpendicular plane to the plane x+y-4z=6 is parallel to the vector with coordinates (1,1,-4) (normal vector of the given plane).

Hence, the equation of needed plane is

$\left\|\begin{array}{ccc}x-0&y-(-3)&z-9\\3-0&0-(-3)&3-9\\1&1&-4\end{array}\right\|=0\Rightarrow \left\|\begin{array}{ccc}x&y+3&z-9\\3&3&-6\\1&1&-4\end{array}\right\|=0$

Thus,

$\left\|\begin{array}{ccc}x&y+3&z-9\\3&3&-6\\1&1&-4\end{array}\right\|=0\Rightarrow \\\\-12x-6(y+3)+3(z-9)-3(z-9)+6x+12(y+3)=0\\ \\-6x+6(y+3)=0\\ \\-x+y+3=0\\ \\x-y-3=0$