It's just asking for the gradient basically
150/3 = 50
Or technically -50 because it's decreasing
        
             
        
        
        
Answer for #9 : 24,720
Answer for #10 : 145
        
             
        
        
        
Answer:
D.
Step-by-step explanation:
cos is positive and sin is negative
=>
it must be in quadrant IV.
you remember, 1 = sin² + cos²
1 = sin² + (3/5)² = sin² + 9/25
25/25 = sin² + 9/25
16/25 = sin²
sin = 4/5 or -4/5
and as sin of this angle is < 0, our solution is -4/5