Question

Question 13 Which expression CANNOT be used to find BC? B 67° 7.8 23° A С 7.2 a. 7.8(sin 239) b. 7.8(cos 67°) 7.S(tan 23° 7.2 tan 67 d.

Answer 1

A. is right becuase you apply the sine correctly

B. Is right because you apply the cosine correctly

C. Is worg rong becuase not use tangent right

if you use tangent with angle 23°, should be

`\begin{gathered} \tan (23)=(BC)/(7.2) \\ \\ BC=7.2\tan (23) \end{gathered}`

then c is a wrong way to apply Tangent and you are not finding BC

Finally right option is C