The answer is b. There is a proof, but it is easily got by proving the other cases wrong.
In triangle, ABD,
AD²= AB²+BD²
AB² = AD²-BD²
AB² = 18²-9² = 324-81 = 243
AB = √243
In triangle, ABC,
AC² = AB²+BC²
AC² = (√243)²+(13)²
AC² = 243+169
AC = √412
AC = 20.29
Answer:
-4
Step-by-step explanation:
3+(-5)-2
3+-5-2
3-7
=-4
Answer:
198
Step-by-step explanation:
