Find the weight in kilograms of 150 pound person rounded to the nearest hundred

see below

Step-by-step explanation:

recall that 1 kg = 2.205 lbs (or 1 lb = 0.4536 kg)

hence,

150 lbs = 150 lbs x 0.4536 kg/lb

= 68.0389 kg

Just to clarify , your question says to round to the nearest "hundred", if this is correct, then 68.0389 kg rounded to the nearest hundred = 100 kg

if you meant to round to the nearest "hundreth", then the answer is 68.04 kg

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.