To answer this you could do a couple things. 1. Actually calculate both tips and then subtract them. Here is the math ( assuming it is $60, not 60% that you mean). a. 0.15 x 60 = $9. b. 0.0825 x 2 x 60=$9.90. c. 9.90-9.00= $0.90 difference. 
The other strategy would be to find the difference on the percents and then multiply by $60. a. 8.25%x2=16.5%-15%. Difference of 1.5%. b. 0.015 x $60=$0.90.
        
             
        
        
        
I think b because all the other lines are the same length and b lines aren’t
        
             
        
        
        
Step-by-step explanation:
g(x) = 3x² + 2x - 1
g(-1) = 3(-1)² + 2(-1) - 1
 = 3(1) -2 -1
 = 3 - 3
 = 0
 
        
             
        
        
        
Answer:

Step-by-step explanation:
we know that
Using proportion

 
        
             
        
        
        
5pi/4 is located in quadrant III.
In Q III, sin and cos are negative, tan is positive. 
T-bar for 5pi/4 is pi/4.
sin and cos are - (sqrt 2)/2
Tan is 1