Answer:
4.99
Step-by-step explanation:
If you divide:
$24.95/5bulbs
you get 
4.99/1 bulb  
 
        
             
        
        
        
Same here, we do a quick switcharoo on the variables first,
 
 
        
        
        
Answer:
Step-by-step explanation:
The secants form a proportion where the full length of the secant is the denominator of a fraction where the numerator is the external part of the secant.
7/(x + 7) = 6/(15 + 6)         Cross Multiply after combining
7 / (x + 7) = 6/(21)                 
6 * (x + 7) = 7 * 21             Remove the brackets
6x + 42 = 147                   Subtract 42
6x = 147 - 42
6x = 105                           Divide by 6
x = 17.5
I think I've done this correctly. If you find an error, please let me know and I'll open it for editing.
 
        
             
        
        
        
Answer:
16.3 repeating
Step-by-step explanation:
3x-4(4)=65
3x-16=65
3x=65-16
3x=49
x=49/3
x=16.3 repeating