Answer:
Salena's got to the library first
Step-by-step explanation:
12½ miles = 25/2 miles
2½ miles = 5/2 miles
5¾ miles = 23/4 miles
114 miles = 114 miles
 Salena's time of arrival =
 if 5/2 miles : 5 minutes
then 25/2 miles : ?
 25/2 ÷ 5/2. × 5
 25/2 × 2/5 × 5
 25 minutes
Justin 's time of arrival=
if 23/4 miles : 12 minutes
 25/2 miles : ?
25/2 ÷ 23/4 ×12
25/2 × 4/23 ×12
 26 minutes approximately
Brandon 's time of arrival=
if 114 miles : 258 minutes
 25/2 miles : ?
 25/2 ÷114 ×258
 25/2 × 1/114×258
 25 × 1/57 × 258
 113 minutes approximately
 
 
        
             
        
        
        
Think of this situation as a system of equations. 
let y be the price of hotdogs
let x be the price of hamburgers 
5y + 2x = 8
2y + 5x = 9.50
now use your solution method of choice 
substitution, elimination, matrices, etc
        
             
        
        
        
Answer:
rong answer is 18 
I think the right answer is 0.75
Step-by-step explanation:
 
        
                    
             
        
        
        
So average is  of the first 6 tests is 82   well that means 
(test1 + test2+ test3+ test4 + test5+test6)/6 = 82
so now let do some cross multiplliying 
test1 + test2 + test3 + test 4 + test5 +test6 = 82*6
test1 + test2 + test3 + test 4 + test5 +test6  = 492
now lets see if we can find that 7th test score
(test1 + test2 + test3 + test4 + test5 +test6 + test7)/7 = 80.5
So look we found test1 + test2 + test3 + test4 + test5 +test6 to be 492 so lets substitute. 
(492 + test7 )/7 = 80.5
test7 = (80.5*7)-492 = 71.5 
        
             
        
        
        
Answer:
⇒ ×3
×3
⇒
Step-by-step explanation: