Answer: -12
Work: Since -4 is in parentheses, I did -4 / 5 first. After doing the division, I had gotten -0.8. I multiplied -0.8 by 15, and had gotten -12.
Answer:
sin 30°=8/c
1/2=8/c
c=16.
tan 60°=b/8
√3=b/8
b=8√3.
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