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10 PTS + BRAINLIEST FOR BEST ANSWER!

Please explain how to do this, thanks!

10 PTS BRAINLIEST FOR BEST ANSWER Please explain how to do this thanks class=

Respuesta :

Answer:

The answer is D.

Step-by-step explanation:

All you have to do is substitute x for 18.

8 x 18 = 144

144 - 21 = 123

RZ = 123

RT = 246