Answer: 18
Step-by-step explanation:
Evaluate 7 r − 15 /s 
Given that r = 3 and s = 5 
7r - 15/s
Substitute 3 for r and 5 for s in the above expression 
7(3) - 15/5
 = 21 - 3
= 18
 
        
             
        
        
        
Answer:
Hello!
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1.2n+1=1-n
= 
n = 0
Step-by-step explanation:  Isolate the variable by dividing each side by factors that don't contain the variable.
Hope this helped you!
 
        
             
        
        
        
i think the person below me is correct and the answer is 12
 
        
                    
             
        
        
        
Answer:
C
Step-by-step explanation:
 
        
                    
             
        
        
        
=−640x10+1280x9+19904x8−40728x7−144488x6+323904x5−162304x4+1024x3+2048x2
step by step
(2x+8x2+3x−4x(x−4)(x−1)(20)x+4)(2)(x+4)(x−4)(2)x(x−1)(2)x(x+4)
=((2x+8x2+3x−4x(x−4)(x−1)(20)x+4)(2)(x+4)(x−4)(2)x(x−1)(2)x)(x+4)
=((2x+8x2+3x−4x(x−4)(x−1)(20)x+4)(2)(x+4)(x−4)(2)x(x−1)(2)x)(x)+((2x+8x2+3x−4x(x−4)(x−1)(20)x+4)(2)(x+4)(x−4)(2)x(x−1)(2)x)(4)
=−640x10+3840x9+4544x8−58904x7+91128x6−40608x5+128x4+512x3−2560x9+15360x8+18176x7−235616x6+364512x5−162432x4+512x3+2048x2
=−640x10+1280x9+19904x8−40728x7−144488x6+323904x5−162304x4+1024x3+2048x2