Help with algebra

Question

Given that: cos0=-4/5 and tan0<0

In what quadrent does 0 lie?

What is sin 0?

What is tan 0?

Answer 1

If cosine is negative and tangent is <0 it is also negative

Cosine and tangent are both negative in quadrant 2

Now draw the angle in quadrant 2

Since cosine is -4/ then adjacent is 4 and hypotenuse is 5 and opposite will be 3( solve the right triangle)

So sine is + 3/5 as sine is positive in quadrant 2