Answer:
the trigonometric function that is equal to the ratio of the side opposite a given angle (in a right triangle) to the hypotenuse.
Step-by-step explanation:
 
        
             
        
        
        
Answer: $20.5
Step-by-step explanation:
Let x  denotes the amount for total bill.
We are given that ,  Sierra left $4.50 as a tip for a waiter.
This was 18% of the bill before the tip.
We can write 18% = 0.18. [To convert percent into decimal we divide it by 100.]
Then, the tip amount = 0.18 x Total bill

So, the total bill amount = $25
Hence, her total bill before the tip=  Total bill amount - Tip amount
= $25- $4.50=$20.5
Thus ,her total bill before the tip= $20.5
 
        
             
        
        
        
Answer:
Step-by-step explanation:
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