Which of the following values is equal to − (−8.2)?
−8.2
0
8
8.2

The answer is 8.2 because you can multiply +,-.

other answer is correct. i had used the radius of the radius somehow. a website:

answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft