The answer is choice A.
We're told that the left and right walls of the cube (LMN and PQR) are parallel planes. Any line contained in one of those planes will not meet another line contained in another plane. With choice A, it's possible to have the front and back walls be non-parallel and still meet the initial conditions. If this is the case, then OS won't be paralle to NR. Similarly, LP won't be parallel to MQ.
From the given figure ,
RECA is a quadrilateral
RC divides it into two parts
From the triangles , ∆REC and ∆RAC
RE = RA (Given)
angle CRE = angle CRA (Given)
RC = RC (Common side)
Therefore, ∆REC is Congruent to ∆RAC
∆REC =~ ∆RAC by SAS Property
⇛CE = CA (Congruent parts in a congruent triangles)
Hence , Proved
<em>Additional comment:-</em>
SAS property:-
"The two sides and included angle of one triangle are equal to the two sides and included angle then the two triangles are Congruent and this property is called SAS Property (Side -Angle-Side)
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Answer-
<em>The inverse of
is </em>

<u>Solution-</u>
The given function is,

We can get the inverse by interchanging he variable x and y among themselves and then separating each variables.
So in the inverse would be,

Taking log of both sides,

As,

Applying the same,


As,

Applying the same,

Therefore, the inverse of
is
.
Mike´s salary=x
Ron´s salary=2x
We can suggest the following equation:
x+2x=441
3x=441
x=441/3
x=147
Mike´s salary=147
Ron´s salary=2x=2(147)=294
Answer: Ron´s salary is $294 and Mike´s salry is $147.