My actual weight is 112 pounds. the bathroom scale says that i weigh 111.1
pounds. the scale at the doctor's office gives a reading of 114.8 pounds.
what is the relative error for the measurement taken at home?

It depends on certain factors

Step-by-step explanation:

If you're wearing shoes and heavy clothing/accessories at the doctors office while stepping on the scale. That could add on as weight. Or either scale (most likely the doctors scale) could pick up your weight more accurately than the other. This depends on the age of the scale or if the scale is electric or not.

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer