A) .10 d + .25 q = 7.75
B) d + q = 40
Multiplying B) by -.10
B)  -.10d -.10q = -4.0
Then adding this to A)
A) .10 d + .25 q = 7.75
.15q = 3.75
Quarters = 25
Therefore, dimes = 15
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Double-Check
A) .10 d + .25 q = 7.75
A) .10 * 15 d + .25 * 25 = 7.75
A) 1.50 + 6.25 = 7.75
Correct!!
        
             
        
        
        
Answer:
81,3 ft to the nearest tenth.
Step-by-step explanation:
Tan 19 = 28 / h  where h = the horizontal distance.
h = 28 / tan 19
h = 81.3 ft.
 
        
             
        
        
        
The answer 7980 divided by .19 =/is 42.  
        
             
        
        
        
Answer:
$1.99 is more expensive.
Step-by-step explanation:
Given:
One type of lace edging cost $0.80 per foot
Another type of lace edging cost $1`.99 per foot.
We need to find which is more expensive.
In $0.88 where one's place is 0.
In $1.99 where one's place is 1.
By comparing the one's place obviously $1.99 more expensive.
Hope you will understand the concept.
Thank you.
 
        
             
        
        
        
<h2>
Answer with explanation:</h2>
The confidence interval for population mean is given by :-
 (1)
                   (1)
, where  = sample mean
 = sample mean 
z* = critical value.
SE = standard error
and  ,
 ,  = population standard deviation.
 = population standard deviation.
n= sample size.
As per given , we have


n= 15
It is known that ring diameter is normally distributed.
 
 
By z-table ,
The critical value for 95% confidence  = z*= 1.96
A 99% two-sided confidence interval on the true mean piston diameter :
 (using (1))
     (using (1))

 [Rounded to three decimal places]
  [Rounded to three decimal places]
∴  A 99% two-sided confidence interval on the true mean piston diameter  = (74.020, 74.022)
By z-table ,
The critical value for 95% confidence  = z*= 1.96
A 95% lower confidence bound on the true mean piston diameter:
  (using (1))
    (using (1))
 [Rounded to three decimal places]
 [Rounded to three decimal places]
∴  A 95% lower confidence bound on the true mean piston diameter= 74.020