En la clase de matematicas hay un total de 50 alumnos han aprobado el 80% ¿Cuántos alumnos han reprovado

Responder:

10

Explicación paso a paso:

Dado que:

Número total de estudiantes = 50

Porcentaje que pasó = 80%

Si pasó el 80%;

luego porcentaje que falló:

(100 - 80)% = 20%

Número que falló:

20% del total de estudiantes

0,2 * 50

= 10 estudiantes reprobaron

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

given that triangle abc is transformed two times to get triangle

a"b"c"

first abc is transformed in to a'b'c' as follows:

the coordinates of a are (1,-1) and transformed into a'(-1,1)

similarly b (4,-2) became b'(-4,2) and

c(7,-2) became c'(-7,2)

i.e. (x,y) becomes (-x,-y)

this is nothing but reflection about a point here origin.

thus first transformation is reflection on the origin.

next is exactly shifting 3 units down

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