¿De cuantas maneras diferentes se pueden seleccionar tres representantes de un grupo de 9 personas para ocupar los cargos de presidente, vicepresidente y secretario?

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

go and ask your mom to you

their is no graph showing

step-by-step explanation:

they disappear if your absent from to long. i found out that the hard way.

step-by-step explanation:

brainliest lol i just need one more brainliest.