PLS HELP ASAP GIVE BRAINLIST FOR CORECT ANSWER

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.

in simplified version   it would be x ≤-4

step-by-step explanation:

multiply each term in x ≤-4 by -1