Answer:
Well, if the line is a good fit for the data then the residual plot will be random. However, if the line is a bad fit for the data then the plot of the residuals will have a pattern.
Step-by-step explanation:
82
1'st step: + = is the formula for the pythagorean theorem
2'nd step : + =
3'rd step: 324+6400 =
4'rd step: 6724=
5'th step: =82
6'th step : therefore the value of c is 82 cm
s/5=b