-21 +3 = -9r in the form of -2(x-p)2+q=

b.my answer is b.

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26

step-by-step explanation:

the answer is d

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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