Answer:
C. a = 7
D. c = -3 
Step-by-step explanation:
C. 7(2a + 3) + 21 = 100+ 40
    14a + 21 + 21 = 140
    14a = 140 - 21 - 21 
     14a = 98 
     a = 7
D. 6+ 14 - 12c = 56
     20 - 12c = 56
      -12c = 56 - 20
      -12c = 36 
        c = - 3
 
        
                    
             
        
        
        
Answer: <em>59.2</em>
Step-by-step explanation:
<em>Take your equation</em>
<em>z2+8y</em>
<em>Now plug in the values given</em>
<em>(12)2+8(4.4)</em>
<em>24+35.2</em>
<em>59.2</em>
 
        
             
        
        
        
The original number is 72 
(18+x)/6 = 1+14 
1/6x + 3 = 1 + 14 (Distribute)
1/6x + 3 = (1+14) (Combine Like Terms)
1/6x + 3 = 15 
        - 3 = -3          (Subtract 3 From Both Sides)
1/6x = 12 
(1/6x)*6 = 12 * 6  (Multiply Both Sides By 6)
x = 72
        
             
        
        
        
Answer:
1 is C and 2 is B
Step-by-step explanation:
 
        
             
        
        
        
Answer:
(-3.07, 11.07)
Step-by-step explanation:
Given that a sports writer wished to see if a football filled with helium travels farther, on average, than a football filled with air. To test this, the writer used eighteen adult male volunteers. These volunteers were randomly divided into two groups of nine subjects each. 
Group   Group One     Group Two  
Mean	300.00	296.00
SD	8.00	6.00
SEM	2.67	2.00
N	9    	9    
The mean of Group One minus Group Two equals 4.00
  
standard error of difference = 3.333
    df = 16
t = 1.2000
Margin of error = 3.3333* t critical = 3.3333*2.121
  95% confidence interval of this difference: From -3.07 to 11.07