Another way to identify the domain and range of functions is by using graphs. Because the domain refers to the set of possible input values, the domain of a graph consists of all the input values shown on the x-axis. The range is the set of possible output values, which are shown on the y-axis
        
             
        
        
        
Answer:
B
Step-by-step explanation:
 
        
             
        
        
        
1).  Her walking pace is  (1.75 miles) / (50 minutes).
If you want it in units of (miles per hour), do it like this:
               (1.75 miles / 50 minutes) x (60 minutes / 1 hour) 
           =  (  1.75 x 60 / 50 ) miles per hour.
2).  The average change was  
                         (30 - 45) degrees  / (5 minutes) .
I'm sure you can do the division and make an integer out of that. 
3).  Each bracelet cost $3.10.
Caroline bought five of them, so she spent $3.10 five times.
Either do the multiplication, or else write down $3.10 five times
and do the addition.
4).  In order to factor the expression, the two terms would need 
to have some common factor ... both terms need either a power 
of 'x', or they need two numbers that have a common factor.
They don't both have an 'x', and 13 and 10 have no common factor.
5).  Todd earned 'T' dollars.
Twice what Todd earned is  2T .
$350 more than that is   2T+350 .
The question says that 2,500 is exactly that amount,
so you can write
                                                  2T + 350 =  2,500 
Subtract 350 from each side:    2T           =  2,150
Divide each side by  2:              (you can finish it now)
        
             
        
        
        
Ok so you would plug in 18 for the x so it would be 6(18)-12 and then 6x18 is 108 and 108-12=96 so your answer is 96