Question

If cos θ=–5/13 and sin θ < 0, what is tan θ ?

Answer 1

thats better
make a triangle

Answer 2

there is the picture of an angle with cosine \(\frac{5}{13}\) you need the missing side of the triangle which you get by pythatoras or just memorizing the \(5:12:13\) right triangle

Answer 3

since you are told both sine and cosine are negative that make tangent positive
it is "opposite over adjacent" and you are done