Micaela sold half of her comic books and then bought fifteen more. She now has 31. With how many did she begin?
2 answers:
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Refer to the diagram shown below.
Because tan θ = 12/5 and cos θ = -5/13, therefore θ is in quadrant 3.
The sine function is negative in quadrant 3, therefore
sin θ = - 12/13
Answer: - 12/13
Because tan θ = 12/5 and cos θ = -5/13, therefore θ is in quadrant 3.
The sine function is negative in quadrant 3, therefore
sin θ = - 12/13
Answer: - 12/13