The position of a swimmer below sea level is represented by –5 meters. the diver descends an additional 3 meters below sea level. which expression describes the new position of the diver?
–5 + (–3)
–5 + 3
5 + (–3)
5 + 3

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.

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step-by-step explanation:

de77737dd